Which of the following is the most stable car | vedclass

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(C) The stability of a carbanion is increased by electron-withdrawing groups $(EWG)$ and decreased by electron-donating groups $(EDG)$ due to the indu

Vedclass · Accepted Answer

$p-O_2N-C_6H_4-CH_2^-$

Vedclass · Answer

(C) The stability of a carbanion is increased by electron-withdrawing groups $(EWG)$ and decreased by electron-donating groups $(EDG)$ due to the inductive and resonance effects.$1.$ $CH_3^-$ is a simple alkyl carbanion.$2.$ $CH_3CH_2^-$ is less stable than $CH_3^-$ due to the $+I$ effect of the methyl group.$3.$ $p-O_2N-C_6H_4-CH_2^-$ contains a nitro group $(-NO_2)$,which is a strong electron-withdrawing group ($-I$ and $-M$ effect). This group effectively disperses the negative charge on the carbon atom,making it the most stable among the given options.$4.$ $p-CH_3-C_6H_4-CH_2^-$ contains a methyl group $(-CH_3)$,which is an electron-donating group ($+I$ and hyperconjugation),thus destabilizing the carbanion.Therefore,the correct option is $C$.

Column-$I$	Column-$II$
$A$. $CH_3-O^{+}=CH-CH_3$	$1$. Stable due to resonance
$B$. $F_3C^{+}$	$2$. Destabilised due to inductive effect
$C$. $(CH_3)_3C^{-}$	$3$. Stabilised by hyperconjugation
$D$. $CH_3-CH^{+}-CH_3$	$4$. $A$ secondary carbocation

Which of the following is the most stable carbanion?

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