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

28 2020 Organic Chemistry - Some Basic Principles and TechniquesElectronic Displacements in a Covalent Bond – Hyperconjugation Easy
A tertiary butyl carbocation is more stable than a secondary butyl carbocation because of which of the following?
A $+R$ effect of $-CH_3$ groups
B $-R$ effect of $-CH_3$ groups
C Hyperconjugation
D $-I$ effect of $-CH_3$ groups

Detailed Solution

Tertiary butyl carbocation has 9 $\alpha$-H atoms, while secondary butyl carbocation has 5 $\alpha$-H atoms. The more the number of $\alpha$-H atoms, the greater the hyperconjugation, and hence the greater the stability of the carbocation.

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