Which of the following carbocations is least | vedclass

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(D) The stability of a benzyl carbocation is influenced by the substituent present on the benzene ring. Electron-donating groups $(EDG)$ increase the

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p-Nitrobenzyl carbocation

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(D) The stability of a benzyl carbocation is influenced by the substituent present on the benzene ring. Electron-donating groups $(EDG)$ increase the stability of the carbocation by donating electron density,while electron-withdrawing groups $(EWG)$ decrease the stability by withdrawing electron density. In the given options: $1$. $p$-Methylbenzyl carbocation has a $-CH_3$ group,which is an electron-donating group ($+I$ and hyperconjugation),making it the most stable. $2$. $p$-Fluorobenzyl carbocation has a $-F$ group,which is weakly electron-withdrawing by induction $(-I)$ but can donate electrons by resonance $(+M)$. $3$. $p$-Cyanobenzyl carbocation has a $-CN$ group,which is a strong electron-withdrawing group ($-I$ and $-M$). $4$. $p$-Nitrobenzyl carbocation has a $-NO_2$ group,which is a very strong electron-withdrawing group ($-I$ and $-M$). Since the $-NO_2$ group is a stronger electron-withdrawing group than the $-CN$ group,the $p$-nitrobenzyl carbocation is the least stable among the given options.

Which of the following carbocations is least stable?

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