Which among the following phenolic compounds | vedclass

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(D) The acidity of phenolic compounds is determined by the stability of the phenoxide ion formed after the loss of a proton. $e-$ withdrawing groups $

Vedclass · Accepted Answer

$p-$Nitrophenol

Vedclass · Answer

(D) The acidity of phenolic compounds is determined by the stability of the phenoxide ion formed after the loss of a proton. $e-$ withdrawing groups $(EWG)$ stabilize the phenoxide ion through $-I$ and $-M$ effects,thereby increasing acidity. $p-$Nitrophenol contains a nitro group at the para position,which exerts both $-I$ and $-M$ effects,significantly stabilizing the phenoxide ion. $m-$Nitrophenol only exerts a $-I$ effect because the $-M$ effect does not operate at the meta position. $p-$Aminophenol contains an amino group,which is an $e-$ donating group ($+M$ effect),decreasing acidity. Therefore,the correct order of acidity is: $p-$Nitrophenol $ > m-$Nitrophenol $ > $ Phenol $ > p-$Aminophenol.

Which among the following phenolic compounds is most acidic in nature?

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Reason : Groups with $+M$ effect decrease acidity at $p-$position.

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