Which one of the following substituents at pa | vedclass

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(C) The stability of the phenoxide ion is increased by electron-withdrawing groups $(EWG)$ through the delocalization of the negative charge on the ox

Vedclass · Accepted Answer

$-COCH_3$

Vedclass · Answer

(C) The stability of the phenoxide ion is increased by electron-withdrawing groups $(EWG)$ through the delocalization of the negative charge on the oxygen atom into the benzene ring.$-CH_3$ and $-CH_2OH$ are electron-donating groups $(EDG)$ and decrease the stability of the phenoxide ion.$-OCH_3$ acts as an electron-donating group via the resonance effect ($+R$ effect),which outweighs its inductive electron-withdrawing effect ($-I$ effect),thus destabilizing the phenoxide ion.$-COCH_3$ is a strong electron-withdrawing group due to both the inductive effect $(-I)$ and the resonance effect $(-R)$.Therefore,the $-COCH_3$ group is the most effective in stabilizing the phenoxide ion at the para position.

Which one of the following substituents at para position is most effective in stabilizing the phenoxide ion?

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