Which one of the following is the most stable | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

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

Vedclass · Accepted Answer

Vedclass · Answer

(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?

Similar Questions

Write in ascending order of stability of $1^{\circ}$,$2^{\circ}$ and $3^{\circ}$ carbocations and free radicals.

Which of the following is the most stable form for the given structure after rearrangement?

Arrange the following carbanions in the order of their stability:
$i$. $RC \equiv C^{\ominus}$
$ii$. $C_6H_5^{\ominus}$
$iii$. $R_2C = CH^{\ominus}$
$iv$. $R_3C - CH_2^{\ominus}$

The correct stability order for the following carbocations is:

Which of the following bridgehead carbocations is the most stable?

Vedclass Test Series

Exam Paper Generator

Online Exam Module