Which of the following has a hyperconjugation | vedclass

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(D) Hyperconjugation requires the presence of an $\alpha$-hydrogen atom on a carbon atom adjacent to a carbocation,a free radical,or a double bond. $1

Vedclass · Accepted Answer

None of these

Vedclass · Answer

(D) Hyperconjugation requires the presence of an $\alpha$-hydrogen atom on a carbon atom adjacent to a carbocation,a free radical,or a double bond. $1$. In the benzyl carbocation $(C_6H_5CH_2^+)$,the $CH_2^+$ group is attached to the benzene ring. The carbon of the $CH_2^+$ group has no $\alpha$-hydrogen atoms attached to it that can participate in hyperconjugation with the vacant $p$-orbital. $2$. In the diphenylmethyl carbocation $((C_6H_5)_2CH^+)$,the central carbon atom is attached to two phenyl rings and has one hydrogen atom,but this hydrogen is not an $\alpha$-hydrogen relative to a vacant $p$-orbital in the way required for hyperconjugation. $3$. In diphenylmethane $((C_6H_5)_2CH_2)$,there is no carbocation,free radical,or double bond adjacent to the $CH_2$ group to facilitate hyperconjugation. Therefore,none of the given options exhibit the hyperconjugation effect.

Which of the following has a hyperconjugation effect?

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