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1

AIPMT 2006

MCQ (Single Correct Answer)
The general molecular formula, which represents the homologous series of alkanols is
A
CnH2nO
B
CnH2nO2
C
CnH2n + 2O
D
CnH2n + 1O

Explanation

All alcohols follow the general formula as CnH2n+2O.
2

AIPMT 2005

MCQ (Single Correct Answer)
The best method for the separation of naphthalene and benzoic acid from their mixture is
A
distillation
B
sublimation
C
chromatography
D
crystallisation.

Explanation

Sublimation would be the best method because it is applicable for those organic compounds which pass directly from solid to vapour state on heating and vice versa on cooling. In these compounds naphthalene is volatile and benzoic acid is nonvolatile due to the formation of dimer via intermolecular hydrogen bonding.
3

AIPMT 2005

MCQ (Single Correct Answer)
Which of the following undergoes nucleophilic substitution exclusively by SN1 mechanism?
A
Ethyl chloride
B
Isopropyl chloride
C
Chlorobenzene
D
Benzyl chloride

Explanation

SN1 reaction is favoured by heavy groups on the carbon atom attached to halogen i.e

Benzyl > allyl > tertiary > primary > secondary > primary > alkyl halides
4

AIPMT 2005

MCQ (Single Correct Answer)
Which amongst the following is the most stable carbocation?
A
$$\mathop C\limits^ + $$H3
B
CH3$$\mathop C\limits^ + $$H2
C
D

Explanation

3o C is more stable due to the stabilization of the charge by three methyl groups (or inductive effect). It can also be explained on the basis of hyperconjugation.

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