Chemistry_Class-12_DPP-2_Ch-6_Haloalkanes and Haloarenes.

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1. The hydrolysis reaction that takes place at the slowest rate among the following is

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2. Which of the following will NOT undergo SN1 reaction with?

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3. The major product formed in dehydrohalogenation reaction of 2-Bromo pentane is Pent-2-ene. This product formation is based on?

A) Hund’s Rule

B) Hofmann Rule

C) Huckel’s Rule

D) Saytzeff’s Rule

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4. The correct sequence of bond enthalpy of ‘C-X’ bond is

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5. Predict the order of reactivity of the following four isomers towards SN2 reaction.

A) (IV) > (III) > (II) >(I)

B) (IV) > (III) > (II) > (I)

C) (I) > (II) > (III) > (IV)

D) (I) > (III) > (II) > (IV)

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6. The given compound is an example of ________

A) Benzylic halide

B) Aryl halide

C) Allylic halide

D) Vinylic halide

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7. The incorrect statement regarding chirality is

A) The product obtained by SN2 reaction of haloalkane having chirility at the reactive site shows inversion of configuration.

B) Enantiomers are superimposable mirror images of each other.

C) A racemic mixture shows zero optical rotation.

D) SN1 reaction yields 1:1 mixture of both enantiomers.

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8. Elimination reaction of 2-Bromopentane to form pent-2-ene is

a) β-eliminaiton reactin b) Followed Zaitsev rule
c) Dehydrohalogenation reaction d) Dehydration reaction

A) (a),(c) ,(d)

B) (a),(c),(d)

C) (a),(b),(d)

D) (a),(b),(c)

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9. Which of the following alkane cannot be made in good yield by Wurtz reaction?

A) 2,3 dimethyl butane

B) n-Heptane

C) n-Butane

D) n-Hexane

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10. Two possible stereo-structures of CH3CHOHCOOH ,which are optically active ,are called.

A) Diastereomers

B) Atropisomers

C) Enantiomers

D) Mesomers

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11. Which of the following compounds will undergo racemization when solution of KOH hydrolyses?

A) (i) and (ii)

B) (ii) and (iv)

C) (iii) and (iv)

D) iv

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12. Which of the following acids not exhibit optical isomerism?

A) Maleic acid

B) 𝜶 −𝒂𝒎𝒊𝒏𝒐 𝒂𝒄𝒊𝒅

C) Lactic acid

D) Tartaric acid

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13. Which of the following is suitable to synthesize chlorobenzene?

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14. The hydrolysis reaction that takes place at the slowest rate, among the following is

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15. Which of the following biphenyls is optically active?

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16. Which of the following compounds undergoes nucleophilic substitution reaction most easily?

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17. Which one is most reactive towards SN1 reaction?

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18. The correct order of increasing reactivity of C - X bond towards nucleophile in the following compounds is

A) ) I < II < IV < III

B) II < III < I < V

C) IV < III < I < II

D) III < II <I <IV

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Chlorobenzene reacts with Mg in dry ether to give a compound which further reacts with ethanol to yield

A) Phenol

B) Benzene

C) Ethylbenzene

D) Phenyl ether

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20. Which chloro derivative of benzene among the following would undergo hydrolysis most readily with aqueous sodium hydroxide to furnish the corresponding hydroxy derivative?

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21. The replacement of chlorine of chlorobenzene to give phenol requires drastic conditions, but the chlorine of 2,4-dinitrochlorobenzene is readily replaced since

A) nitro groups make the aromatic ring electron rich at ortho/para positions.

B) nitro groups withdraw electrons from the meta position of the aromatic ring.

C) nitro groups donate electrons at meta position.

D) nitro groups withdraw electrons from ortho/para positions of the aromatic ring.

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22. Trichloroacetaldehyde, CCI3CHO reacts with chlorobenzene in presence of sulphuric acid and produces: