A tertiary butyl carbocation is more stable than a secondary butyl carbocation because of which of the following ?

Hyperconjugation

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+ R

effect of

- C H_{3}

groups

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- I

effect of

C H_{3}

groups

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- R

effect of

- C H_{3}

groups

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Solution

The correct option is A Hyperconjugation
Tertiary carbocations are stable due to inductive effect (+I effect of alkyl groups) and hyperconjugation.

Tert. butyl carbocation has greater number of $9 α - H$ in comparison to sec butyl carbocation which has only $5 α - H$ . This increases hyperconjugation which results to its greater stability.

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