The correct acidity order of phenol (I), 4-hy | vedclass

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(B) Electron-withdrawing groups $(EWG)$ like $-CHO$ increase the acidity of phenols by stabilizing the phenoxide ion.In $4-$hydroxybenzaldehyde $(II)$

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$I < III < II$

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(B) Electron-withdrawing groups $(EWG)$ like $-CHO$ increase the acidity of phenols by stabilizing the phenoxide ion.In $4-$hydroxybenzaldehyde $(II)$, the $-CHO$ group is at the para position and exerts both $-M$ (mesomeric) and $-I$ (inductive) effects.In $3-$hydroxybenzaldehyde $(III)$, the $-CHO$ group is at the meta position and exerts only the $-I$ effect (the mesomeric effect does not operate at the meta position).Phenol $(I)$ has no such electron-withdrawing group.Therefore, the acidity order is $I < III < II$.

The correct acidity order of phenol $(I)$, $4-$hydroxybenzaldehyde $(II)$ and $3-$hydroxybenzaldehyde $(III)$ is:

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