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(C) The acidity of substituted phenols is determined by the electron-withdrawing or electron-donating nature of the substituent. $NO_2$ is a strong el

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para-nitrophenol

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(C) The acidity of substituted phenols is determined by the electron-withdrawing or electron-donating nature of the substituent. $NO_2$ is a strong electron-withdrawing group $(EWG)$ due to both $-I$ and $-M$ effects. In $para$-nitrophenol,the $-NO_2$ group is at the $para$ position,allowing for strong $-M$ (mesomeric) effect stabilization of the phenoxide ion. In $ortho$-nitrophenol,intramolecular hydrogen bonding stabilizes the phenol molecule itself,which slightly reduces its acidity compared to $para$-nitrophenol. $Meta$-nitrophenol only exerts the $-I$ effect,as the $-M$ effect does not operate at the $meta$ position. Therefore,the order of acidity is: $para$-nitrophenol > $ortho$-nitrophenol > $meta$-nitrophenol > $para$-chlorophenol. Thus,$para$-nitrophenol is the strongest acid among the given options.

The strongest acid among the following aromatic compounds is

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