Which of the following carbocations is least | vedclass

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Question

(B) The stability of a carbocation is determined by the electronic effects of the substituents attached to the benzene ring.$1$. The $-NO_2$ group is

Vedclass · Accepted Answer

o-Nitrobenzyl carbocation $(o-NO_2-C_6H_4CH_2^+)$

Vedclass · Answer

(B) The stability of a carbocation is determined by the electronic effects of the substituents attached to the benzene ring.$1$. The $-NO_2$ group is a strong electron-withdrawing group ($-I$ and $-M$ effects).$2$. In the ortho-nitrobenzyl carbocation,the $-NO_2$ group is at the ortho position,which exerts a strong destabilizing effect due to both $-I$ and $-M$ effects,making it the least stable among the given options.$3$. The meta-nitrobenzyl carbocation is more stable than the ortho-isomer because the $-M$ effect is not directly operative at the meta position.$4$. The $p-methoxy$ group is electron-donating ($+M$ effect),which significantly stabilizes the carbocation.$5$. Therefore,the ortho-nitrobenzyl carbocation is the least stable.

Which of the following carbocations is least stable?

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