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

(CH₃)₃C-

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(CH₃)₂CH

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CH₃CH₂ -

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CH_3-

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Solution

The correct option is D
CH_3-

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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