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AIPMT PRELIMS2005Chemistry-Organic Chemistry

AIPMT PRELIMS 2005 Chemistry Carbocations MCQ Question

Type: MCQ-conceptual-Medium-Class 11

Which amongst the following is the most stable carbocation?

A

CH3−C∣CH3+−H\text{CH}_3 - \overset{+}{\underset{\substack{| \\ \text{CH}_3}}{\text{C}}} - \text{H}

B

CH3−C+∣CH3CH3∣\text{CH}_3 - \overset{\substack{\text{CH}_3 \\ |}}{\underset{\substack{| \\ \text{CH}_3}}{\text{C}^+}}

C

C+H3\overset{+}{\text{C}}\text{H}_3

D

CH3C+H2\text{CH}_3\overset{+}{\text{C}}\text{H}_2

Correct Answer

Option B

Detailed Explanation

The stability of carbocations increases with the number of alkyl groups attached to the positively charged carbon due to hyperconjugation and inductive effects. The tertiary carbocation (option B) is the most stable.

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