JKSSB Conservation Assistant 2025 Solved Question Paper

Question 1

Which of the following is the correct definition of 'Museology'?

Accepted Answer

Option C: The science and practice of organizing and managing museums. Museology is the comprehensive academic discipline, science, and practice concerning the history, philosophy, organization, management, social role, and conservation of museums.

Question 2

Who is regarded as the founder of the Asiatic Society in Kolkata?

Accepted Answer

Option C: Sir William Jones. Sir William Jones founded the Asiatic Society of Bengal in Calcutta on 15 January 1784 to promote oriental research and establish India's earliest museum collection.

Question 3

Which of the following statements are correct regarding museums and museology?
1. Museology refers to the study of museum collections and the design of exhibits.
2. A museum is primarily concerned with preserving artifacts, while museography focuses on the scientific aspects of organizing and displaying exhibits.
3. The history of the Indian Museum dates back to the 18th century, with its foundation laid in 1850.
4. A museum collection includes only primary sources, which are directly related to the subject matter of the exhibits.
5. Documentation systems in museums ensure that detailed information about each exhibit is accurately recorded and easily retrievable.
Options :

Accepted Answer

Option A: Statements 1, 2, and 5 are correct. Statements 1, 2, and 5 are correct definitions regarding museum theory, museography techniques, and computerized collection documentation systems.

Question 4

What is the purpose of a museum's 'documentation system'?

Accepted Answer

Option B: To track and record detailed information about museum objects. A museum documentation system establishes provenance, accession registers, condition reports, catalogue entries, and digital metadata to track and preserve complete information on every object.

Question 5

Arrange the following steps of museum collection management in the correct order:
i) Cataloguing the items
ii) Acquiring objects through donations or purchases
iii) Organizing exhibitions
iv) Documenting the objects in the museum's records
Options :

Accepted Answer

Option C: ii, iv, i, iii. Sequential steps in museum collection lifecycle: (ii) Acquisition -> (iv) Accessioning and documentation -> (i) Detailed cataloguing and classification -> (iii) Exhibition and display.

Question 6

Which of the following statements are correct about museum collections and their role in education?
1. Primary sources in museum collections are artifacts or documents that were created at the time of the event being studied.
2. Secondary sources in museum collections include items such as replicas or photographs that provide interpretations of the past.
3. Museum galleries and their design are crucial for enhancing visitor experience and should reflect the overall theme of the exhibits.
4. A museum's communication policy focuses solely on advertising and attracting more visitors to the museum.
5. A museum plays a vital role in non-formal education, offering informal learning experiences outside of traditional classrooms.
Options :

Accepted Answer

Option A: Statements 1, 3, and 5 are correct. Statements 1, 3, and 5 accurately describe primary artifact sources, gallery visitor-centric design, and informal public pedagogical roles (statement 4 is false as communication encompasses educational outreach, not sole advertising).

Question 7

Match the Following
Column A:
1. Museology
2. Museum Collection
3. Communication Policy
4. Museum as an Educational Institution

Column B:
i. The study and practice of managing, conserving, and studying museum objects and exhibits
ii. The strategy for promoting the museum's mission and engaging with the public.
iii. A place that offers informal learning experiences outside traditional classrooms.
iv. The collection of objects, which includes primary and secondary sources, as well as exhibitions.

Options :

Accepted Answer

Option A: 1-i, 2-iv, 3-ii, 4-iii. 1 -> i (Museology = study and management of objects), 2 -> iv (Collection = primary/secondary objects), 3 -> ii (Communication = mission promotion and public engagement), 4 -> iii (Educational institution = informal learning).

Question 8

Arrange the following developments in the history of the Indian Museums in chronological order :
i. Establishment of the Asiatic Society of Bengal
ii. Establishment of the Indian Museum in Kolkata
iii. Establishment of the National Museum in New Delhi
iv. Museum collections began to be organized systematically for public display
Options :

Accepted Answer

Option A: i, ii, iv, iii. Chronological timeline: (i) Asiatic Society of Bengal founded in 1784 -> (ii) Indian Museum founded in Kolkata in 1814 -> (iv) Systematic public display organization (late 19th/early 20th century under ASI) -> (iii) National Museum established in New Delhi in 1949.

Question 9

Which of the following was the first professional membership association for those working in the museum?

Accepted Answer

Option B: Museums Association, UK. The Museums Association (UK), founded in York in 1889, is the world's oldest professional association for museum personnel.

Question 10

Disposal of art objects means :

Accepted Answer

Option C: Physical removal of the objects. In museum terminology, disposal (deaccessioning) refers to the formal permanent physical and administrative removal of an object from the museum's permanent accession register.

Question 11

Which of the following new concepts were added to the museum definition of ICOM of 2022?
i. Humanity
ii. Sustainability
iii. Inclusive
iv. Community participation
v. Researches
Choose the correct answer from the options given below:

Accepted Answer

Option B: ii, iii, and iv only. At the ICOM General Conference in Prague (August 2022), the new museum definition incorporated: 'accessible and inclusive', 'foster diversity and sustainability', and 'with the participation of communities'.

Question 12

Which of the following are related to documentation of museum objects?
i. JATAN
ii. CIDOC
iii. SPECTRUM
iv. SPSS
v. STAT
Choose the correct answer from the options given below:

Accepted Answer

Option A: i, ii, and iii only. JATAN is the Indian national museum digital collection database software; CIDOC is ICOM's International Committee for Documentation; SPECTRUM is the UK collection management standard.

Question 13

Match List I with List II
List I (Object):
1. Didarganj Yakshi
2. Pistol of Chandrasekhar Azad
3. Siva Vamana
4. Veiled Rebecca

List II (Venue):
i. Salarjung Museum
ii. National Museum
iii. Patna Museum
iv. Allahabad Museum

Choose the correct answer from the options given below:

Accepted Answer

Option D: 1-iii, 2-iv, 3-ii, 4-i. Didarganj Yakshi -> Patna Museum / Bihar Museum (1-iii), Colt Pistol of Chandrasekhar Azad -> Allahabad Museum (2-iv), Siva Vamana (Mansar sculpture) -> National Museum, New Delhi (3-ii), Veiled Rebecca (Benzoni marble statue) -> Salar Jung Museum, Hyderabad (4-i).

Question 14

What is the primary purpose of the communication policy of a museum?

Accepted Answer

Option B: To promote the museum's collection and exhibitions to the public. A museum's communication policy is structured to convey educational knowledge, promote exhibits, engage diverse communities, and project the institution's public mission.

Question 15

Why is the design of a museum gallery and building important?

Accepted Answer

Option B: To enhance the visitor experience and ensure the safety of collections. Museum architectural and interior gallery design integrates environmental control, conservation security, circulation flow, lighting, and visitor interpretive engagement.

Question 16

Which of the following statements are true regarding the role of museums as agencies of non-formal education?
i. Museums provide hands-on learning experiences outside traditional classroom settings.
ii. Museums offer formal degrees and certifications to students.
iii. Museums encourage critical thinking and cultural awareness.
iv. Museums only focus on historical artifacts and ignore contemporary issues.
Options :

Accepted Answer

Option A: i and iii are correct. Museums facilitate non-formal, lifelong experiential learning through interactive discovery and foster cultural awareness and critical thinking (statements i and iii are true).

Question 17

What is delocalized chemical bonding?

Accepted Answer

Option C: Bonding where electrons are spread over several atoms in a molecule. Delocalized bonding occurs when $\pi$-electrons or non-bonding lone pairs extend over three or more adjacent parallel p-orbitals in a conjugated system.

Question 18

Which of the following best describes the concept of conjugation?

Accepted Answer

Option A: The alternating single and double bonds between adjacent atoms in a molecule. Conjugation is the overlap of parallel p-orbitals across alternating single and double (or multiple) bonds, allowing $\pi$-electron delocalization.

Question 19

What does the Rule of Resonance State?

Accepted Answer

Option A: A molecule with delocalized electrons can be represented by two or more valid Lewis structures called resonance structures. The resonance model states that when a single Lewis formula cannot accurately describe electron distribution, the true molecule is a hybrid of two or more canonical resonance structures.

Question 20

Which of the following is an example of steric inhibition of resonance?

Accepted Answer

Option B: The disruption of resonance due to bulky substituents that hinder orbital coplanarity. Steric Inhibition of Resonance (SIR) occurs when bulky ortho substituents force an adjacent conjugated functional group out of coplanarity with the aromatic ring, quenching orbital overlap and resonance.

Question 21

Which of the following is true according to Huckel's rule for aromaticity?

Accepted Answer

Option B: A molecule is aromatic if it has $4n+2\ \pi$-electrons, where n is a non-negative integer. Huckel's rule ($4n+2\ \pi$-electrons, where $n = 0, 1, 2, 3\dots$) defines the electron requirement for planar, fully conjugated cyclic monocyclic polyenes to possess special aromatic thermodynamic stabilization.

Question 22

What is the molecular orbital description of aromaticity and antiaromaticity?

Accepted Answer

Option B: Aromatic compounds have electrons in bonding molecular orbitals and antiaromatic compounds have electrons in anti-bonding/non-bonding orbitals. In Frost circle MO diagrams, aromatic species possess completely filled, closed-shell bonding molecular orbitals, whereas antiaromatic ($4n\ \pi$) species have unpaired electrons in degenerate non-bonding or anti-bonding orbitals.

Question 23

Which of the following is an example of homoaromaticity?

Accepted Answer

Option C: A molecule with delocalized electrons, where the aromaticity is maintained by skipping an intervening $sp^3$ hybridized carbon. Homoaromaticity (e.g. the homotropylium cation $C_8H_9^+$) occurs when a stabilized $(4n+2)\ \pi$-electron system bypasses a non-conjugated $sp^3$-hybridized carbon atom through direct cross-space orbital overlap.

Question 24

Which statement is true about hyperconjugation?

Accepted Answer

Option B: Hyperconjugation involves the donation of electron density from adjacent $\sigma$-bonds to an empty or partially filled p-orbital. Hyperconjugation (no-bond resonance / Baker-Nathan effect) involves stabilizing delocalization of electron density from adjacent $C-H$ or $C-C\ \sigma$-orbitals into an adjacent vacant or partially filled p-orbital or $\pi^*$ orbital.

Question 25

What is the defining feature of chirality in a molecule?

Accepted Answer

Option B: The presence of a chiral centre (a carbon atom attached to four different substituents). Point chirality in organic chemistry arises primarily when an $sp^3$-hybridized tetrahedral carbon atom is bonded to four distinct, non-identical atoms or substituent groups.

Question 26

Which of the following is an example of a molecule with more than one chiral centre?

Accepted Answer

Option D: Tartaric acid. Tartaric acid ($HOOC-CH(OH)-CH(OH)-COOH$) contains two identical asymmetric stereocenters (C2 and C3), exhibiting $(2R,3R)$, $(2S,3S)$, and achiral meso forms.

Question 27

Which of the following is true about threo and erythro isomers?

Accepted Answer

Option B: They are types of diastereomers that differ in the relative positions of substituents on two adjacent chiral centres. Erythro and threo isomers are diastereomers with two adjacent chiral centers; erythro has identical/similar substituents on the same side in Fischer projection, whereas threo has them on opposite sides.

Question 28

Which of the following molecules exhibits optical activity in the absence of a chiral carbon?

Accepted Answer

Option A: Biphenyls. Sterically hindered ortho-tetrasubstituted biphenyls exhibit atropisomerism (axial chirality) due to restricted rotation about the $C-C$ single bond, showing optical activity without any chiral carbon center.

Question 29

How does chirality arise in molecules like allenes and spirans, which do not have chiral centres?

Accepted Answer

Option C: By having non-superimposable mirror images arising from perpendicular dissymmetric planes. Allenes ($R_1R_2C=C=CR_3R_4$) and spirans have mutually perpendicular $\pi$-systems and planes of substituents; with dissimilar terminal groups, they lack planes/centers of symmetry, forming non-superimposable chiral mirror images.

Question 30

What is the term used for atoms, groups, or faces that are oriented in such a way that they produce enantiomers when flipped or replaced?

Accepted Answer

Option A: Enantiotropic. Enantiotropic ligands or faces yield enantiomeric products upon separate replacement or addition of an achiral test group.

Question 31

Match the Following -
Column A:
1. Chirality due to chiral center
2. Threo and Erythro isomers
3. Optical activity in the absence of Chiral carbon
4. Chirality due to helical shape

Column B:
i. Molecules that exhibit optical activity despite not having a chiral carbon (e.g., biphenyls, allenes, spirans)
ii. Refers to the presence of a chiral center, usually a carbon attached to four different substituents.
iii. Molecules like helicenes, which exhibit chirality because of their non-superimposable helical structure.
iv. Diastereomers that arise due to the relative orientation of substituents around two chiral centers.

Options :

Accepted Answer

Option A: 1-ii, 2-iv, 3-i, 4-iii. 1 -> ii (Chiral center), 2 -> iv (Threo/Erythro diastereomers), 3 -> i (Optical activity without chiral carbon: biphenyls), 4 -> iii (Helical chirality: helicenes).

Question 32

Arrange the following events related to chirality and symmetry in molecules in chronological order:
i. Discovery of chirality due to the presence of a chiral centre (a carbon atom attached to four different substituents).
ii. Identification of chirality in molecules with more than one chiral centre (such as threo and erythro isomers).
iii. Recognition of chirality in molecules like biphenyls, allenes, and spirans, where optical activity occurs without a chiral carbon.
iv. Understanding of chirality due to helical shape in molecules (e.g., helicenes).
Options :

Accepted Answer

Option A: i, ii, iii, iv. Historical progression: (i) Pasteur/van 't Hoff/Le Bel asymmetric carbon (1874) -> (ii) Fischer carbohydrate diastereomers (1890s) -> (iii) Christie/Kenner biphenyl atropisomerism (1922) -> (iv) Newman synthesis and resolution of hexahelicene (1955-1956).

Question 33

Which of the following is a characteristic of a reaction mechanism?

Accepted Answer

Option B: It involves a sequence of elementary steps that show how the reaction occurs.. A reaction mechanism is the stepwise sequence of elementary microscopic steps detailing bond-breaking, bond-forming, intermediate formation, and electron movement leading from reactants to products.

Question 34

Which of the following types of reactions typically proceeds through a two-step mechanism?

Accepted Answer

Option C: Substitution reaction. Unimolecular nucleophilic substitution ($S_N1$) and electrophilic aromatic substitution ($S_E	ext{Ar}$) are classical prototypes of two-step reaction mechanisms involving carbocation or arenium ion intermediates.

Question 35

Thermodynamic control of a reaction favours the formation of the product that :

Accepted Answer

Option D: Is the most stable product. Under thermodynamic control (elevated temperatures, reversible equilibrium conditions), the product with the lowest free energy (highest thermodynamic stability) predominates.

Question 36

Which of the following structural factors typically increases the reactivity of a molecule?

Accepted Answer

Option D: High electronegativity of atoms near the reactive center. Electronegative atoms induce polarization, creating electrophilic centers with enhanced susceptibility to nucleophilic attack.

Question 37

Arrange the following steps involved in a reaction mechanism in the correct order:
i. Formation of a reactive intermediate
ii. Collision of reactant molecules
iii. Transition state formation
iv. Conversion of the intermediate to product
Options :

Accepted Answer

Option C: ii, iii, i, iv. Stepwise sequence: (ii) Reactant molecules collide -> (iii) Activation to the first transition state -> (i) Formation of reactive intermediate -> (iv) Progression over second transition state to final product.

Question 38

Arrange the following reactions in the correct chronological order based on thermodynamic and kinetic control.
i. Kinetic product formation, which occurs faster but is less stable
ii. Thermodynamic product formation, which is more stable but slower to form
iii. Reactants undergo activation energy to reach the transition state
iv. The reaction pathway is dictated by the temperature and conditions (low temperature favours the kinetic product, high temperature favours the thermodynamic product)
Options :

Accepted Answer

Option A: iii, i, iv, ii. Progressive sequence: (iii) Energy supplied to cross transition state -> (i) Rapid formation of low-activation kinetic product -> (iv) Reversible equilibration governed by temperature -> (ii) Final convergence to thermodynamically most stable product.

Question 39

Match the Following :-
Column A:
1. Thermodynamic Control
2. Kinetic Control
3. Steric Effect
4. Resonance Effect

Column B:
i) Reaction that favours the most stable product, even if it forms more slowly.
ii) Effect that occurs when bulky groups around a reactive centre hinder the approach of other molecules.
iii) Effect that stabilizes a molecule through delocalization of electrons within the structure
iv) Reaction that favours the fastest forming product, even if it is less stable.

Options :

Accepted Answer

Option A: 1-i, 2-iv, 3-ii, 4-iii. 1 -> i (Thermodynamic = most stable), 2 -> iv (Kinetic = fastest forming), 3 -> ii (Steric = bulky hindrance), 4 -> iii (Resonance = delocalization stabilization).

Question 40

Match the Following
Column A:
1. Field Effect
2. Quantitative Treatment of Reactivity
3. Steric Effect in Reactions
4. Resonance Effect in Reactions

Column B:
i) The influence of electron withdrawing or electron-donating groups on the reactivity of a molecule
ii) A method that uses mathematical models to predict the rate of reaction and other mechanistic details
iii) Effect where atoms or groups physically hinder the approach of reactants, affecting the rate of reaction
iv) The influence of the delocalization of electrons that can stabilize or destabilize intermediates in a reaction

Options :

Accepted Answer

Option A: 1-i, 2-ii, 3-iii, 4-iv. 1 -> i (Field/Inductive effect), 2 -> ii (Hammett/Taft quantitative LFER models), 3 -> iii (Steric bulk hindrance), 4 -> iv (Resonance delocalization).

Question 41

Which of the following reactions is an example of an aliphatic electrophilic substitution reaction?

Accepted Answer

Option A: Halogenation of methane. Halogenation of alkanes (or organometallic metal exchange) represents substitution on saturated aliphatic systems.

Question 42

Which of the following correctly matches the features of $S_E1$, $S_E2$, and $S_Ei$ mechanisms?

Accepted Answer

Option A: SE1: Involves a two-step mechanism with a carbocation intermediate; rate depends on substrate and solvent. SE2: A concerted mechanism involving a backside attack; rate depends on the nucleophile and solvent. SEi: Involves an intramolecular shift of the double bond before substitution occurs.. In Electrophilic Aliphatic Substitution: $S_E1$ is unimolecular stepwise (rate-determining carbanion formation), $S_E2$ is bimolecular frontside/backside concerted, and $S_Ei$ proceeds with internal return retaining configuration.

Question 43

Which of the following statements correctly describes the key features of the $S_N1$ and $S_N2$ nucleophilic substitution mechanisms?
i. $S_N1$ reactions involve a two-step mechanism with a carbocation intermediate, resulting in racemization of chiral centers.
ii. $S_N2$ reactions occur via a single-step mechanism, where the nucleophile attacks the substrate in a backside attack, leading to inversion of configuration.
iii. The rate of $S_N1$ reactions depends only on the concentration of the nucleophile.
iv. $S_N2$ reactions are favoured by polar protic solvents.
Options :

Accepted Answer

Option A: i and ii are correct. Statements i and ii are correct: $S_N1$ produces planar carbocations with racemization; $S_N2$ proceeds via a concerted backside attack with Walden inversion.

Question 44

Which of the following factors correctly affect the rate of $S_N1$ and $S_N2$ reactions?
i. $S_N1$ reactions are faster with tertiary carbocations due to the stability of the carbocation intermediate.
ii. $S_N2$ reactions are faster when the nucleophile is stronger and the substrate is less sterically hindered.
iii. The leaving group is more important in $S_N2$ reactions than in $S_N1$ reactions.
iv. Polar protic solvent generally accelerate $S_N2$ reactions by stabilizing the transition state.
Options :

Accepted Answer

Option A: i and ii are correct. Statements i and ii are correct. $S_N1$ reactivity order is $3^\circ > 2^\circ > 1^\circ$; $S_N2$ reactivity order is $	ext{Methyl} > 1^\circ > 2^\circ > 3^\circ$ with strong nucleophiles and polar aprotic solvents.

Question 45

Arrange the following aliphatic electrophilic substitution reactions in order of increasing reactivity towards the electrophilic substitution:
i. Halogenation of methane
ii. Halogenation of ethane
iii. Halogenation of propane
iv. Halogenation of isobutane
Options :

Accepted Answer

Option A: i -> ii -> iii -> iv. Radical/electrophilic substitution rates increase with increasing alkyl branching due to greater hyperconjugative stability of the intermediate free radicals: Methane ($1 ext{, } CH_4$) < Ethane ($1^\circ ext{, } ii$) < Propane ($2^\circ ext{, } iii$) < Isobutane ($3^\circ ext{, } iv$).

Question 46

Match the Following :
List I (Reaction Mechanism):
i) SE1
ii) SE 2
iii) SE i
iv) Migration of double bond in SEi

List II (Description/Characteristics):
1. Involves a two-step mechanism with a carbocation/carbanion intermediate, followed by attack
2. Involves a concerted mechanism with backside/frontside attack and departure of the leaving group
3. Intramolecular migration of a double bond before the substitution occurs
4. The reaction rate depends on the concentration of both the substrate and the reagent

Options :

Accepted Answer

Option C: i-1, ii-4, iii-2, iv-3. i -> 1 ($S_E1$ = two-step), ii -> 4 ($S_E2$ = bimolecular second-order kinetics), iii -> 2 ($S_Ei$ = concerted frontside internal return), iv -> 3 ($S_Ei'$ = allylic double bond migration).

Question 47

Which of the following correctly describes the effects of substrate structure, attacking nucleophile, leaving group, and solvent on the rates of $S_N1$ and $S_N2$ reactions?
i. $S_N1$ reactions are faster with tertiary substrates due to the stability of the carbocation intermediate.
ii. $S_N2$ reactions are favoured by polar protic solvents because they stabilize the leaving group.
iii. $S_N1$ reactions are more sensitive to the leaving group than $S_N2$ reactions.
iv. $S_N2$ reactions are faster with a strong nucleophile and less sterically hindered substrates.
Options :

Accepted Answer

Option A: i and iv are correct. Statements i and iv are correct: $S_N1$ requires $3^\circ$ carbocation stabilization, while $S_N2$ requires strong unhindered nucleophiles and unhindered substrates.

Question 48

Which of the following factors increases the rate of an $S_N2$ nucleophilic substitution reaction?
i) A strong nucleophile
ii) A primary substrate (less sterically hindered)
iii) A polar protic solvent
iv) A good leaving group
Options :

Accepted Answer

Option A: i, ii, and iv are correct. The rate law $	ext{Rate} = k[	ext{Substrate}][	ext{Nu}^-]$ accelerates with strong nucleophiles (i), primary $1^\circ$ unhindered substrates (ii), and excellent leaving groups (iv); polar aprotic solvents (not protic) enhance $S_N2$.

Question 49

Which of the following statements best describes the E2 elimination mechanism?

Accepted Answer

Option B: The reaction proceeds via a concerted mechanism with the base abstracting a proton and the leaving group departing simultaneously. The E2 (bimolecular elimination) reaction is a single-step concerted process where a strong base removes a $\beta$-proton while the leaving group departs from the $\alpha$-carbon in an anti-periplanar transition state.

Question 50

In the E1 elimination mechanism, which of the following is the rate-determining step?

Accepted Answer

Option A: The departure of the leaving group to form a carbocation. The slow, rate-determining step (RDS) in an E1 reaction is the unimolecular heterolytic cleavage of the $C-X$ bond to form a carbocation intermediate.

Question 51

Which of the following factors increases the rate of E2 elimination reactions?

Accepted Answer

Option A: A strong base. Since the rate law is $	ext{Rate} = k[	ext{Substrate}][	ext{Base}]$, increasing base strength directly accelerates the E2 elimination pathway.

Question 52

In an E2 reaction, what is the stereochemical requirement for the elimination to occur?

Accepted Answer

Option A: The leaving group and the hydrogen must be anti-periplanar. E2 elimination strictly requires an anti-coplanar / anti-periplanar conformation (dihedral angle $	heta = 180^\circ$) between the $\beta-H$ and $\alpha-	ext{leaving group}$ to maximize orbital overlap for the forming $\pi$-bond.

Question 53

Which of the following statements about the competition between substitution and elimination reactions are true?
i) E2 reactions are favoured by strong bases, while $S_N2$ reactions are favoured by strong nucleophiles.
ii) E1 reactions typically require a weak base and often occur when a tertiary substrate is involved.
iii) $S_N1$ reactions are favoured in polar protic solvents that stabilize the carbocation intermediate.
iv) E2 elimination is favoured by bulky bases, especially when the substrate is secondary or tertiary.
Options :

Accepted Answer

Option D: i, ii, and iv are correct. Statements i, ii, and iv correctly summarize competitive mechanistic pathways: bulky non-nucleophilic strong bases (e.g., $t-	ext{BuO}^-$) steer sterically hindered substrates away from $S_N2$ into pure E2 elimination.

Question 54

Which of the following statements regarding Pyrolytic Eliminations and the Shapiro Reaction are correct?
i. In pyrolytic elimination, the reaction mechanism involves direct elimination without the formation of a carbocation intermediate.
ii. The Shapiro reaction typically involves the elimination of a halide from an aryl or alkyl halide using strong bases under thermal conditions.
iii. Pyrolytic elimination requires specific stereochemistry, with the leaving group and proton being anti-periplanar to each other for the elimination to occur.
iv. The Shapiro reaction leads to the formation of alkenes via a radical mechanism rather than a carbocation intermediate.
Options :

Accepted Answer

Option A: i, ii, and iii are correct. Pyrolytic eliminations (e.g. ester pyrolysis, Chugaev reaction, Cope elimination) are concerted unimolecular eliminations ($E_i$) proceeding via cyclic transition states (syn-coplanar geometry) without carbocations.

Question 55

Which of the following statements correctly describes the E2 and E1cB elimination mechanism?
i. E2 reactions proceed in a concerted mechanism, where the base abstracts a proton and the leaving group departs simultaneously.
ii. E1cB eliminations involve the formation of a carbanion intermediate before the leaving group departs.
iii. E2 reactions are favoured by strong bases and polar protic solvents, whereas E1cB reactions are favoured by weak bases and polar aprotic solvents.
iv. E1cB reactions typically occur when the leaving group is a good leaving group and the substrate is in a conjugated system.
Options :

Accepted Answer

Option A: i and ii are correct. Statements i and ii are correct. $E1cB$ (Elimination Unimolecular conjugate Base) occurs with poor leaving groups ($F, OH$) and acidic protons, forming a stabilized carbanion intermediate prior to leaving group expulsion.

Question 56

Which of the following statements is correct regarding Elimination reactions (E1 and E2)?
i. E2 reactions proceed in a concerted mechanism, where the base abstracts a proton and the leaving group departs simultaneously.
ii. E1 reactions proceed via a carbocation intermediate and the leaving group departs before the proton is abstracted.
iii. E2 reactions are favoured by strong bases, whereas E1 reactions are favoured by weak bases.
iv. Both E1 and E2 reactions require the leaving group to be anti-periplanar to the proton abstracted for the elimination to occur.
Options :

Accepted Answer

Option C: i, ii, and iii are correct. Statements i, ii, and iii are all correct regarding E1 vs E2 kinetics, intermediate carbocation formation, and base strength dependencies (statement iv is false because E1 has no anti-periplanar requirement).

Question 57

Which of the following is the correct sequence of steps in the Aromatic Electrophilic Substitution reaction mechanism.
i. The electrophile attacks the aromatic ring and forms a sigma complex (also known as an arenium ion).
ii. The aromatic ring regains its aromaticity by the departure of the leaving group (proton loss).
iii. The electrophile is generated by the activation of the reagent, usually by a catalyst.
iv. The reaction proceeds through a two-step mechanism involving the formation of an intermediate cationic species.
Options :

Accepted Answer

Option B: iii -> i -> ii -> iv. Stepwise sequence: (iii) Generation of active electrophile $E^+$ -> (i) Electrophilic attack forming carbocationic $\sigma$-complex (arenium ion) -> (ii) Base removes proton to restore aromaticity -> (iv) Overall two-step cationic intermediate process.

Question 58

Which of the following statements are true regarding Aromatic Electrophilic Substitution reactions?
i. In Aromatic Electrophilic Substitution, the aromatic ring acts as a nucleophile, attacking the electrophile.
ii. Electron-withdrawing groups on the aromatic ring generally decrease the rate of the electrophilic substitution.
iii. The reaction intermediate in the aromatic electrophilic substitution mechanism is a cationic sigma complex (arenium ion).
iv. The leaving group must be strongly basic to facilitate the departure during the substitution.
Options :

Accepted Answer

Option A: i, ii, and iii are correct. Statements i, ii, and iii are true: the electron-rich aromatic $\pi$-cloud acts as a nucleophile, EWGs deactivate the ring, and the rate-determining intermediate is a resonance-stabilized arenium ion.

Question 59

Which of the following statements regarding Aromatic Electrophilic Substitution reactions are correct?
i. The arenium ion is a positively charged intermediate that is formed after the electrophile attacks the aromatic ring.
ii. The energy profile diagram of an electrophilic substitution typically shows two activation energy barriers, one for the formation of the arenium ion and another for the departure of the leaving group.
iii. The orientation of the substituent (either ortho, meta, or para) in the arenium ion is determined by the nature of the substituent already present on the aromatic ring.
iv. Electron-donating groups on the aromatic ring make the reaction faster by stabilizing the arenium ion intermediate through inductive or resonance effects.
Options :

Accepted Answer

Option C: i, iii, and iv are correct. Statements i, iii, and iv are correct: EDGs stabilize the arenium carbocation intermediate via resonance/inductive donation, accelerating substitution and directing incoming electrophiles ortho/para.

Question 60

Which of the following statements is true regarding the orientation of electrophilic substitution reactions in heterocyclic rings such as pyridine, furan, and thiophene?
i. In pyridine, the electron-rich nitrogen atom directs incoming electrophiles to the meta position relative to the nitrogen.
ii. In furan, the oxygen atom donates electron density through resonance, making the ortho and para positions relative to the oxygen more reactive towards electrophiles.
iii. In thiophene, the sulphur atom withdraws electron density, directing electrophilic substitution to the meta position relative to the sulphur atom.
iv. In pyridine, electrophilic substitution is generally less favourable due to the basic nature of nitrogen, which makes the ring less reactive.
Options :

Accepted Answer

Option C: i, ii, and iv are correct. Pyridine undergoes electrophilic substitution sluggishly at the C3 (meta) position due to ring deactivation by the electronegative nitrogen, while furan ($2-\alpha$ position) and thiophene are $\pi$-excessive aromatic heterocycles.

Question 61

Which of the following statements is correct regarding ortho/para and ipso attack in aromatic electrophilic substitution reactions?
i. Ortho/para attack in aromatic systems occurs when electron-donating groups (EDGs) are attached to the ring, which increase electron density in the ortho and para positions, making them more reactive toward electrophiles.
ii. Ipso attack involves the electrophile attacking the position directly attached to the existing substituent on the aromatic ring.
iii. Ortho/para substitution is favored when the substituent on the aromatic ring is electron withdrawing (EWG), as it stabilized the intermediate cation at the ortho/para positions.
iv. Ipso attack is particularly common in reactions with substituted aromatic rings, such as in halogenation and nitration reactions.
Options :

Accepted Answer

Option A: i and ii are correct. Statements i and ii are correct: EDGs activate ortho/para positions; Ipso attack is defined as electrophilic attack at an already substituted aromatic ring carbon, often leading to displacement of that substituent (e.g., protodesilylation, desulfonation).

Question 62

Given the following substituted benzene rings, select the correct order of substitution orientation (ortho/para vs. meta) for an electrophilic substitution reaction:
1. Ring A: $-NO_2$ (electron-withdrawing) and $-OH$ (electron-donating)
2. Ring B: $-NO_2$ (electron-withdrawing) and $-CH_3$ (electron-donating)
3. Ring C: $-COOH$ (electron-withdrawing) and $-OCH_3$ (electron-donating)
Which of the following correctly orders the preferred positions for electrophilic substitution (ortho/para vs meta)?
Options :

Accepted Answer

Option A: Ring A : ortho/para > meta, Ring B : ortho/para > meta, Ring C : ortho/para > meta. In disubstituted benzenes containing both an activating EDG ($-OH, -CH_3, -OCH_3$) and a deactivating EWG ($-NO_2, -COOH$), the orientation is strictly dictated by the stronger activating electron-donating group (favoring ortho/para positions).

Question 63

Match the following reactions with their correct descriptions:
List I (Reaction Type):
1. Diazonium Coupling
2. Vilsmeier-Haack
3. Gattermann-Koch
4. Fries Rearrangement

List II (Description):
i. Formation of aromatic aldehydes via formylation using CO and HCl with Lewis acid
ii. Formation of aryl ketones / hydroxyaryl ketones via hydroxyacylation of phenols
iii. Coupling of diazonium salts with aromatic compounds to form azo dyes
iv. Formation of aromatic aldehydes by electrophilic substitution with a formyl group using DMF and POCl3

Options :

Accepted Answer

Option A: 1-iii, 2-iv, 3-i, 4-ii. 1 -> iii (Diazonium coupling = azo dyes), 2 -> iv (Vilsmeier-Haack = DMF/POCl3 formylation), 3 -> i (Gattermann-Koch = CO/HCl formylation), 4 -> ii (Fries rearrangement = phenolic ester to hydroxyaryl ketone).

Question 64

Which of the following statements about Aromatic Electrophilic Substitution are true?
i. Electron-donating groups (EDGs) increase the electron density on the aromatic ring and activate it towards electrophilic substitution.
ii. Electron-withdrawing groups (EWGs) deactivate the aromatic ring and direct electrophilic substitution to the meta position relative to the substituent.
iii. In benzene, electrophilic substitution reactions proceed via the formation of a carbocation intermediate (arenium ion).
iv. In nitration, the electrophile is a nitrate ion ($NO_3^-$), which directly attacks the benzene ring.
Options :

Accepted Answer

Option B: i, ii, and iii are correct. Statements i, ii, and iii are true. Statement iv is incorrect because the active nitrating electrophile is the nitronium ion ($NO_2^+$), generated from $HNO_3/H_2SO_4$.

Conservation Assistant2025

📝 Solved Questions with Detailed Explanations100% Free • No Login Required

JKSSB — Conservation Assistant (2025)

Which of the following is the correct definition of 'Museology'?

Who is regarded as the founder of the Asiatic Society in Kolkata?

What is the purpose of a museum's 'documentation system'?

Arrange the following steps of museum collection management in the correct order:i) Cataloguing the itemsii) Acquiring objects through donations or purchasesiii) Organizing exhibitionsiv) Documenting the objects in the museum's recordsOptions :

Which of the following was the first professional membership association for those working in the museum?

Disposal of art objects means :

Which of the following new concepts were added to the museum definition of ICOM of 2022?i. Humanityii. Sustainabilityiii. Inclusiveiv. Community participationv. ResearchesChoose the correct answer from the options given below:

Which of the following are related to documentation of museum objects?i. JATANii. CIDOCiii. SPECTRUMiv. SPSSv. STATChoose the correct answer from the options given below:

Match List I with List IIList I (Object):1. Didarganj Yakshi2. Pistol of Chandrasekhar Azad3. Siva Vamana4. Veiled RebeccaList II (Venue):i. Salarjung Museumii. National Museumiii. Patna Museumiv. Allahabad MuseumChoose the correct answer from the options given below:

What is the primary purpose of the communication policy of a museum?

Why is the design of a museum gallery and building important?

What is delocalized chemical bonding?

Which of the following best describes the concept of conjugation?

What does the Rule of Resonance State?

Which of the following is an example of steric inhibition of resonance?

Which of the following is true according to Huckel's rule for aromaticity?

What is the molecular orbital description of aromaticity and antiaromaticity?

Which of the following is an example of homoaromaticity?

Which statement is true about hyperconjugation?

What is the defining feature of chirality in a molecule?

Which of the following is an example of a molecule with more than one chiral centre?

Which of the following is true about threo and erythro isomers?

Which of the following molecules exhibits optical activity in the absence of a chiral carbon?

How does chirality arise in molecules like allenes and spirans, which do not have chiral centres?

What is the term used for atoms, groups, or faces that are oriented in such a way that they produce enantiomers when flipped or replaced?

Which of the following is a characteristic of a reaction mechanism?

Which of the following types of reactions typically proceeds through a two-step mechanism?

Thermodynamic control of a reaction favours the formation of the product that :

Which of the following structural factors typically increases the reactivity of a molecule?

Arrange the following steps involved in a reaction mechanism in the correct order:i. Formation of a reactive intermediateii. Collision of reactant moleculesiii. Transition state formationiv. Conversion of the intermediate to productOptions :

Which of the following reactions is an example of an aliphatic electrophilic substitution reaction?

Which of the following correctly matches the features of SE1S_E1SE​1, SE2S_E2SE​2, and SEiS_EiSE​i mechanisms?

Arrange the following aliphatic electrophilic substitution reactions in order of increasing reactivity towards the electrophilic substitution:i. Halogenation of methaneii. Halogenation of ethaneiii. Halogenation of propaneiv. Halogenation of isobutaneOptions :

Which of the following factors increases the rate of an SN2S_N2SN​2 nucleophilic substitution reaction?i) A strong nucleophileii) A primary substrate (less sterically hindered)iii) A polar protic solventiv) A good leaving groupOptions :

Which of the following statements best describes the E2 elimination mechanism?

In the E1 elimination mechanism, which of the following is the rate-determining step?

Which of the following factors increases the rate of E2 elimination reactions?

In an E2 reaction, what is the stereochemical requirement for the elimination to occur?

Which of the following reactions involves the rearrangement of a nitro group in an aromatic compound?

Find the correct order of the mechanisms based on the chronological discovery of the reactions :i. Von-Richter rearrangementii. Sommelet-Hauser rearrangementiii. Smiles rearrangementiv. Chichibabin reactionOptions :

In the free radical substitution reaction of methane with chlorine in excess methane, which product is primarily formed?

Which of the following steps involves the formation of free radicals in a free radical substitution mechanism?

Which of the following factors primarily influences the reactivity of an aromatic substrate in a nucleophilic substitution reaction?

Which of the following reactions is characterized by the formation of a free radical intermediate and is commonly initiated using NBS (N-Bromosuccinimide)?

Arrange the following reactions in order of decreasing reactivity of the attacking radical in each reaction :i. Allylic halogenation with NBSii. Oxidation of aldehydes to carboxylic acidsiii. Coupling of alkynesiv. Hunsdiecker reactionOptions :

Advantages of 'Fibre Optics' lighting in museum showcases are :i. It does not produce heatii. It is easy to installiii. It does not emit UV raysiv. Less expensivev. It is safeChoose the correct answer from the options given below:

Environmental control in museum involves :i. Use of Lux Meterii. Use of Burglar Alarmiii. Use of Whirling Hygrometeriv. Use of RFID card accession numberv. Use of UV meterChoose the correct answer from the options given below:

Write in chronological order the life cycle of an insect :i. Adultii. Larvaiii. Pupaiv. EggChoose the correct answer from the options given below:

Which of the following chemical compounds is a fumigant good for treating almost all kinds of museum objects?

Match List I with List IIList I (Symptom of biodeterioration):1. Foxing2. Permanent disfigurement3. Powder formation4. OdorList II (Type of object):i. Wooden objectii. Leather objectiii. Paperiv. PhotographOptions :

Which of the following is the primary reason for controlling light exposure in the conservation of museum objects?

What is the most effective method for controlling insect damage in museum collections?

Which of the following is crucial to prevent fungal growth in a museum collection?

In preventive conservation, which atmospheric condition should be controlled to preserve museum objects effectively?

Which of the following is an effective strategy for protecting museum objects from air pollution?

Arrange in order the steps involved in treatment of a paper manuscript:i) Removal of acidity (Deacidification)ii) Filling of holesiii) Opening of damaged bindingiv) Numbering of foliosv) Binding of foliosChoose the correct answer from the options given below :

Arrange the following metals in the increasing order of activity (reactivity series):i) Copperii) Zinciii) Goldiv) Silverv) LeadChoose the correct answer from the options given below

Which of the following methods is commonly used in the conservation of terracotta artifacts?

Why is an alcoholic medium commonly used for the conservation of biological animals in an aquatic medium?

What is commonly used as a base material in the conservation of mannequins?

Due to photochemical effect what would be the damage at first in a framed oil painting?i) Painting (pigments, Ink)ii) Backgroundiii) Frameiv) Wallv) AdhesivesChoose the correct answer from the options given below:

Which of the following methods is most commonly used to protect bronze artifacts from corrosion?

To prevent tarnishing of brass artifacts, which of the following treatments is recommended?

World Heritage Convention is another name for :

Indian Treasure Trove Act was first enacted in the year

According to Wildlife Protection Act 1972 'Live Stock' means

Antiquity is defined underi. The Antiquities and Art Treasures Actii. The Treasure Trove Actiii. The Ancient Monuments and Archaeological Sites and Remains Activ. The World Heritage Conventionv. The Venice CharterChoose the most appropriate answer from the options given below:

Where is the Dogra Art Museum located?

Arrange the following periods traced in Burzahom in chronological order:i. Neolithic Periodii. Mesolithic Periodiii. Proto-Historic PeriodOptions :

What is the primary purpose of the Jammu and Kashmir Ancient Monuments Preservation Act of 1977 (1920 A.D.)?

What is an archive, and when was the first archive established in Jammu and Kashmir?

When is World Heritage Day celebrated?

How is the identification of antiquities made?

What is the primary objective of the Ancient Monuments and Archaeological Sites and Remains Act of 1958?

When is World Heritage Week celebrated?

What is preventive conservation?

🎯 Ready for a Timed Mock Test?

Arrange the following steps of museum collection management in the correct order:
i) Cataloguing the items
ii) Acquiring objects through donations or purchases
iii) Organizing exhibitions
iv) Documenting the objects in the museum's records
Options :

Which of the following new concepts were added to the museum definition of ICOM of 2022?
i. Humanity
ii. Sustainability
iii. Inclusive
iv. Community participation
v. Researches
Choose the correct answer from the options given below:

Which of the following are related to documentation of museum objects?
i. JATAN
ii. CIDOC
iii. SPECTRUM
iv. SPSS
v. STAT
Choose the correct answer from the options given below:

Match List I with List II
List I (Object):
1. Didarganj Yakshi
2. Pistol of Chandrasekhar Azad
3. Siva Vamana
4. Veiled Rebecca

List II (Venue):
i. Salarjung Museum
ii. National Museum
iii. Patna Museum
iv. Allahabad Museum

Choose the correct answer from the options given below:

Arrange the following steps involved in a reaction mechanism in the correct order:
i. Formation of a reactive intermediate
ii. Collision of reactant molecules
iii. Transition state formation
iv. Conversion of the intermediate to product
Options :

Which of the following correctly matches the features of $S_E1$ , $S_E2$ , and $S_Ei$ mechanisms?

Arrange the following aliphatic electrophilic substitution reactions in order of increasing reactivity towards the electrophilic substitution:
i. Halogenation of methane
ii. Halogenation of ethane
iii. Halogenation of propane
iv. Halogenation of isobutane
Options :

Which of the following factors increases the rate of an $S_N2$ nucleophilic substitution reaction?
i) A strong nucleophile
ii) A primary substrate (less sterically hindered)
iii) A polar protic solvent
iv) A good leaving group
Options :

Find the correct order of the mechanisms based on the chronological discovery of the reactions :
i. Von-Richter rearrangement
ii. Sommelet-Hauser rearrangement
iii. Smiles rearrangement
iv. Chichibabin reaction
Options :

Arrange the following reactions in order of decreasing reactivity of the attacking radical in each reaction :
i. Allylic halogenation with NBS
ii. Oxidation of aldehydes to carboxylic acids
iii. Coupling of alkynes
iv. Hunsdiecker reaction
Options :

Advantages of 'Fibre Optics' lighting in museum showcases are :
i. It does not produce heat
ii. It is easy to install
iii. It does not emit UV rays
iv. Less expensive
v. It is safe
Choose the correct answer from the options given below:

Environmental control in museum involves :
i. Use of Lux Meter
ii. Use of Burglar Alarm
iii. Use of Whirling Hygrometer
iv. Use of RFID card accession number
v. Use of UV meter
Choose the correct answer from the options given below:

Write in chronological order the life cycle of an insect :
i. Adult
ii. Larva
iii. Pupa
iv. Egg
Choose the correct answer from the options given below:

Match List I with List II
List I (Symptom of biodeterioration):
1. Foxing
2. Permanent disfigurement
3. Powder formation
4. Odor

List II (Type of object):
i. Wooden object
ii. Leather object
iii. Paper
iv. Photograph

Options :

Arrange in order the steps involved in treatment of a paper manuscript:
i) Removal of acidity (Deacidification)
ii) Filling of holes
iii) Opening of damaged binding
iv) Numbering of folios
v) Binding of folios
Choose the correct answer from the options given below :

Arrange the following metals in the increasing order of activity (reactivity series):
i) Copper
ii) Zinc
iii) Gold
iv) Silver
v) Lead
Choose the correct answer from the options given below

Due to photochemical effect what would be the damage at first in a framed oil painting?
i) Painting (pigments, Ink)
ii) Background
iii) Frame
iv) Wall
v) Adhesives
Choose the correct answer from the options given below:

Antiquity is defined under
i. The Antiquities and Art Treasures Act
ii. The Treasure Trove Act
iii. The Ancient Monuments and Archaeological Sites and Remains Act
iv. The World Heritage Convention
v. The Venice Charter
Choose the most appropriate answer from the options given below:

Arrange the following periods traced in Burzahom in chronological order:
i. Neolithic Period
ii. Mesolithic Period
iii. Proto-Historic Period
Options :