Which of the following alkyl group has the maximum hyperconjugation effect and

Question -

Which of the following alkyl group has the maximum hyperconjugation effect and least +I effect?

Options:

A .

(C H_{3})_{3} C -

B .

(C H_{3})_{2} C H

C .

C H_{3} C H_{2} -

D .

C H_{3} -

Answer: Option D
:
D

When a methyl group is attached to an alkene or conjugated system, it shows maximum hyperconjugation.

$C H_{3} - C H = C H_{2} \to$ Has 3 hyper conjugative structures.

$C H_{3} C H_{2} - C H = C H_{2} \to$ Has 2 hyper conjugative structures.

+I effect of ethyl is more than methyl but methyl shows more hyperconjugation due to the presence of higher number of alpha hydrogens.

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