Arrange the following compounds in order of d | vedclass

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(C) The acidity of substituted phenols depends on the nature of the substituent group attached to the benzene ring.Electron-withdrawing groups $(EWG)$

Vedclass · Accepted Answer

$III > I > II > IV$

Vedclass · Answer

(C) The acidity of substituted phenols depends on the nature of the substituent group attached to the benzene ring.Electron-withdrawing groups $(EWG)$ stabilize the phenoxide ion through $-I$ and $-M$ effects,thereby increasing acidity.Electron-releasing groups $(ERG)$ destabilize the phenoxide ion through $+I$ and $+M$ effects,thereby decreasing acidity.Comparing the substituents:$III$ $(NO_2)$: Strong $-M$ and $-I$ effect (Strongest acid).$I$ $(Cl)$: $-I$ effect (Weakly acidic).$II$ $(CH_3)$: $+I$ effect and hyperconjugation (Electron releasing).$IV$ $(OCH_3)$: Strong $+M$ effect (Strongest electron releasing group,weakest acid).Thus,the order of decreasing acidity is $III > I > II > IV$.

Arrange the following compounds in order of decreasing acidity:

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