In which of the following does the hyperconju | vedclass

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(D) Hyperconjugation requires the presence of an $\alpha$-hydrogen atom on a carbon atom adjacent to an unsaturated system (like a double bond or a ca

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None of these

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(D) Hyperconjugation requires the presence of an $\alpha$-hydrogen atom on a carbon atom adjacent to an unsaturated system (like a double bond or a carbocation). In option $A$,$CH_2=CH-CH_2^+$,the carbocation is adjacent to a double bond,but there are no $\alpha$-hydrogens on the $sp^2$ hybridized carbons attached to the positive charge. In option $B$,$CH_3-CH=CH-CH_2^+$,the carbocation is adjacent to a double bond,but the adjacent carbon $(CH)$ has only one hydrogen. However,hyperconjugation typically refers to the interaction of $\sigma$-electrons of a $C-H$ bond with an adjacent empty $p$-orbital. Actually,in $CH_3-CH=CH-CH_2^+$,the $CH_3$ group is not directly attached to the carbocationic center. However,looking at the standard definition,hyperconjugation occurs in alkyl carbocations like $CH_3-CH_2^+$. None of the provided structures represent a simple alkyl carbocation with $\alpha$-hydrogens directly attached to the cationic carbon. Therefore,the correct answer is $D$.

In which of the following does the hyperconjugation effect operate?

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