Which of the following is the most stable car | vedclass

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

Question

(D) The stability of a carbanion is increased by electron-withdrawing groups ($-I$ or $-M$ effect) and decreased by electron-donating groups ($+I$ or

Vedclass · Accepted Answer

Vedclass · Answer

(D) The stability of a carbanion is increased by electron-withdrawing groups ($-I$ or $-M$ effect) and decreased by electron-donating groups ($+I$ or $+M$ effect).In the given options,all are substituted benzyl carbanions.$1$. $p$-methylbenzyl carbanion: The $-CH_3$ group shows $+I$ and hyperconjugation $(+H)$ effects,which destabilize the carbanion.$2$. $m$-methylbenzyl carbanion: The $-CH_3$ group shows only $+I$ effect,which destabilizes the carbanion.$3$. $p$-methoxybenzyl carbanion: The $-OCH_3$ group shows a strong $+M$ effect,which strongly destabilizes the carbanion.$4$. $m$-methoxybenzyl carbanion: The $-OCH_3$ group shows a strong $-I$ effect from the meta position (as $+M$ is not effective at the meta position),which stabilizes the carbanion.Comparing these,the $-I$ effect of the $-OCH_3$ group at the meta position makes the $m$-methoxybenzyl carbanion the most stable among the given options.

Which of the following is the most stable carbanion?

Similar Questions

The arrangement of $CH_3-CH_2-CH_2-$,$(CH_3)_2CH-$,and $(CH_3)_3C-$ groups in increasing order of their inductive effect ($+I$ effect) is:

Which of the following electromeric effect representations is incorrect?

What is the inductive effect? Explain it in detail.

Which of the two: $O_2NCH_2CH_2O^{-}$ or $CH_3CH_2O^{-}$ is expected to be more stable and why?

Vedclass Test Series

Exam Paper Generator

Online Exam Module