A tertiary butyl carbocation is more stable than a secondary... | Chemistry | SolveeIt | Solveeit

Today, August 18

Question

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

A

$-I$ effect of $-CH_3$ groups

B

$+R$ effect of $-CH_3$ groups

C

$- R$ effect of $-CH_3$ groups

D

Hyperconjugation

Answer

Hyperconjugation

Explanation

Solution

Tertiary carbocations are stable due to inductive effect (+I effect of alkyl groups) and hyperconjugation.
Tert. carbocation has greater number of alpha H in comparison to sec carbocation. This increases hyperconjugation which results to its greater stability.