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Which of the following is the most stable carbocation (carbonium ion)?

1. (a) CH₃⊕CH₂
2. (b) (CH₃)₂⊕CH
3. (c) (CH₃)₃⊕C
4. (d) C₆H₅⊕CH₂

Correct answer: (c) (CH₃)₃⊕C

Solution

The most stable carbocation is (CH₃)₃⊕C because it is a tertiary carbocation, which is stabilized by hyperconjugation and inductive effects from three methyl groups. These effects are stronger than in primary or secondary carbocations.

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