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 Multiple Choice QuestionsMultiple Choice Questions

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11.

Which of the following reactions will yield 2, 2-dibromopropane?

  • CH3 – C ≡ CH + 2HBr →

  • CH3CH = CHBr + HBr →

  • CH ≡ CH + 2HBr →

  • CH ≡ CH + 2HBr →


A.

CH3 – C ≡ CH + 2HBr →


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12.

Reaction of trans-2-phenyl-1-bromocyclopentane on reaction with alcoholic KOH produces 

  • 4-phenylcyclopentene

  • 2-phenylcyclopentene

  • 1-phenylcyclopentene

  • 1-phenylcyclopentene


D.

1-phenylcyclopentene

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13.

The organic chloro compound, which shows complete stereochemical inversion during a SN2 reaction,is

  • (C2H5)2CHCl 

  •  (CH3)3CCl

  • (CH3)2CHCl

  • (CH3)2CHCl


B.

 (CH3)3CCl

D.

(CH3)2CHCl

For SN2 reaction, the C atom is least hindered towards the attack of nucleophile in the case of (CH3Cl).

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14.

Toluene is nitrated and the resulting product is reduced with tin and hydrochloric acid. The product so obtained is diazotised and then heated with cuprous bromide. The reaction mixture so formed contains

  • mixture of o− and p−bromotoluenes

  • mixture of o− and p−dibromobenzenes

  • mixture of o− and p−bromoanilines

  • mixture of o− and p−bromoanilines


A.

mixture of o− and p−bromotoluenes



First, sulphonationis the means to block para position and to reduce the reactivity of phenolic ring against strong oxidising agent HNO3. (The use of conc. HNO3 over phenol cause the oxidation of ring mainly). The strong acidic medium in second step cause desulphonation also.


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15.

Presence of a nitro group in a benzene ring -

  • activates the ring towards electrophilic substitution

  • renders the ring basic

  • deactivates the ring towards nucleophilic substitution

  • deactivates the ring towards nucleophilic substitution


D.

deactivates the ring towards nucleophilic substitution

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16.

The IUPAC name of 

  • 1, 1-diethyl-2-dimethylpentane

  • 4, 4-dimethyl-5, 5-diethylpentane

  • 5, 5-diethyl-4, 4-dimethylpentane

  • 5, 5-diethyl-4, 4-dimethylpentane


D.

5, 5-diethyl-4, 4-dimethylpentane



3-ethyl-4, 4 dimethylheptane
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17.

Which of the following is the correct order of decreasing SN2 reactivity? 

  • RCH2X > R3CX > R2CHX

  • RCH2X > R2CHX > R3CX

  • R3CX > R2CHX >RCH2X

  • R3CX > R2CHX >RCH2X


B.

RCH2X > R2CHX > R3CX

More is the steric hindrance at the carbon bearing the halogen, lesser is the SN2 reactivity. 

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18.

Phenyl magnesium bromide reacts with methanol to give

  • a mixture of anisole and Mg(OH)Br

  • a mixture of benzene and Mg(OMe)Br

  • a mixture of toluene and Mg(OH)Br

  • a mixture of toluene and Mg(OH)Br


B.

a mixture of benzene and Mg(OMe)Br

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19.

The treatment of CH3MgX with CH3C≡C−H produces

  • CH3−CH=CH

  • CH3C≡C−CH3


D.

CH3-MgX + CH3-C≡C-H→ CH4

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20.

The structure of the major product formed in the following reaction


D.

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