Which of the following groups as X will decre | vedclass

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(A) The $pKa$ value is inversely proportional to the acidity of the compound.Electron-withdrawing groups ($-I$ or $-M$ effect) increase the acidity of

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$-NO_2$

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(A) The $pKa$ value is inversely proportional to the acidity of the compound.Electron-withdrawing groups ($-I$ or $-M$ effect) increase the acidity of benzoic acid derivatives by stabilizing the carboxylate anion,which in turn decreases the $pKa$ value.Among the given options,$-NO_2$ is a strong electron-withdrawing group ($-M$ and $-I$ effect).Therefore,the presence of $-NO_2$ as $X$ will increase the acidity and decrease the $pKa$ value.

Which of the following groups as $X$ will decrease the $pKa$ value of the given compound?

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