1. - I effect of - CH ₃ groups 2. +R effect of - CH ₃ groups 3. - R effect of - CH ₃ groups 4. Hyperconjugation

Topic: Inductive effect, electromeric effect, resonance, hyperconjugation· Some Basic Principles of Organic Chemistry

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

1. \(-\)I effect of \(-\)CH\(_3\) groups

2. +R effect of \(-\)CH\(_3\) groups

3. \(-\)R effect of \(-\)CH\(_3\) groups

4. Hyperconjugation

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Answer: 4. Hyperconjugation

Methyl groups attached to the positive carbon stabilise it by hyperconjugation: C-H sigma electrons delocalise into the empty p orbital.

A tertiary butyl cation has 9 alpha C-H bonds; a secondary butyl cation has only 5. More hyperconjugation gives greater stability. (CH3 is +I, not -I, and has no R effect.) Answer: option (4).

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

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