In which of the following is hyperconjugation | vedclass

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Question

(A) Hyperconjugation requires the presence of at least one $\alpha$-hydrogen atom on a carbon atom adjacent to an unsaturated system (like a double bo

Vedclass · Accepted Answer

$C_6H_5-C(CH_3)_3$

Vedclass · Answer

(A) Hyperconjugation requires the presence of at least one $\alpha$-hydrogen atom on a carbon atom adjacent to an unsaturated system (like a double bond or a benzene ring) or a carbocation. In the given options: $A$) $C_6H_5-C(CH_3)_3$: The $\alpha$-carbon is attached to three methyl groups and the benzene ring. It has no $\alpha$-hydrogen atoms,so hyperconjugation is not possible. $B$) $C_6H_5-CH(CH_3)_2$: The $\alpha$-carbon has one $\alpha$-hydrogen atom. $C$) $C_6H_5-CH_2-CH_3$: The $\alpha$-carbon has two $\alpha$-hydrogen atoms. $D$) $C_6H_5-CH_3$: The $\alpha$-carbon has three $\alpha$-hydrogen atoms. Therefore,the correct option is $(A)$.

In which of the following is hyperconjugation not possible?

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