Question

Among the following, the most stable carbocation is

• A. \(\text{CH}_3^+\)
• B. \((\text{CH}_3)_2\text{CH}^+\)
• C. \(\text{CH}_3\text{-CH}_2^+\)
• D. \((\text{CH}_3)_3\text{C}^+\)

Hint:

More alkyl groups on the positive carbon give more hyperconjugation and inductive stabilisation.

Answer 1

The Correct Option is D

Step 1: Idea:
Count how many alkyl groups are attached to the carbon that carries the positive charge.

Step 2: Count:
Methyl cation: 0. Ethyl cation: 1. Isopropyl cation: 2. tert-Butyl cation: 3. Each extra alkyl group spreads the charge a little more, so the stability grows with the count.

Final Answer:
The tertiary carbocation $(\text{CH}_3)_3\text{C}^+$ is the most stable, option (D). \[ \boxed{(\text{CH}_3)_3\text{C}^+} \]