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1

AIPMT 2005

MCQ (Single Correct Answer)
Names of some compounds are given. Which one is not in IUPAC system?
A
B
C
D

Explanation

2

AIPMT 2005

MCQ (Single Correct Answer)
The chirality of the compound
A
R
B
S
C
E
D
Z

Explanation

3

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.
4

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

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