Consider the following compounds. Hyperconjug | vedclass

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(C) Hyperconjugation requires the presence of an $\alpha-H$ atom on a carbon atom adjacent to a double bond,a carbocation,or a free radical.In compoun

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$III$ only

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(C) Hyperconjugation requires the presence of an $\alpha-H$ atom on a carbon atom adjacent to a double bond,a carbocation,or a free radical.In compound $(I)$,the radical carbon is attached to a carbon atom that has no $\alpha-H$ atoms (it is bonded to three methyl groups). Thus,it does not show hyperconjugation.In compound $(II)$,the radical carbon is attached to three phenyl groups,none of which provide $\alpha-H$ atoms for hyperconjugation.In compound $(III)$,the radical carbon is attached to a bridgehead carbon and a carbon atom bearing a methyl group. The carbon atom adjacent to the radical carbon (the one with the $-CH_3$ group) has one $\alpha-H$ atom. Therefore,hyperconjugation occurs in compound $(III)$.

Consider the following compounds. Hyperconjugation occurs in:

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