Which of the following is the most acidic sub | vedclass

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(D) The acidity of carboxylic acids is increased by electron-withdrawing groups $(EWG)$ attached to the ring.In $p-nitrobenzoic$ acid $(O_2N-C_6H_4-CO

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$O_2N-C_6H_4-COOH$

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(D) The acidity of carboxylic acids is increased by electron-withdrawing groups $(EWG)$ attached to the ring.In $p-nitrobenzoic$ acid $(O_2N-C_6H_4-COOH)$,the $-NO_2$ group exerts both a strong $-I$ (inductive) effect and a $-M$ (mesomeric) effect.These effects stabilize the carboxylate anion by withdrawing electron density,making it the most acidic among the given options.

Which of the following is the most acidic substance?

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