Which one of the following is the most stable | vedclass

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(A) The stability of a carbocation is increased by electron-donating groups $(EDG)$ through resonance or inductive effects.In the given structures,all

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(A) The stability of a carbocation is increased by electron-donating groups $(EDG)$ through resonance or inductive effects.In the given structures,all carbocations are allylic and have a $-NO_2$ group (a strong electron-withdrawing group) attached to the same carbon as the positive charge.The stability depends on the substituent at the para-position relative to the double bond.Option $A$ has an $-OH$ group,which is a strong electron-donating group by resonance ($+M$ effect).Option $B$ has a $-Cl$ group,which is electron-withdrawing by induction $(-I)$ but donating by resonance $(+M)$. However,the $-I$ effect dominates.Option $C$ has a $-CH_3$ group,which is electron-donating by hyperconjugation and inductive effect $(+I)$.Option $D$ has an $-NHCOCH_3$ group,which is electron-donating by resonance $(+M)$.Comparing the $+M$ effects,the $-OH$ group is a stronger electron donor than $-NHCOCH_3$ due to the delocalization of the lone pair on nitrogen into the carbonyl group in $-NHCOCH_3$,which reduces its donating ability to the ring.Therefore,the carbocation with the $-OH$ group is the most stable.

Which one of the following is the most stable carbocation?

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