Which of the following has the lowest pK_{a} | vedclass

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(D) The $pK_{a}$ value is inversely proportional to the acidity of the compound. $A$ lower $pK_{a}$ value indicates a stronger acid.$1$. $p$-nitrophen

Vedclass · Accepted Answer

$p$-nitrobenzoic acid

Vedclass · Answer

(D) The $pK_{a}$ value is inversely proportional to the acidity of the compound. $A$ lower $pK_{a}$ value indicates a stronger acid.$1$. $p$-nitrophenol is a phenol,which is significantly less acidic than carboxylic acids.$2$. Among the carboxylic acids ($B$,$C$,and $D$),the acidity depends on the electronic effects of the substituents on the benzene ring.- In $p$-methoxybenzoic acid $(C)$,the $-OCH_{3}$ group exerts a $+M$ (mesomeric) effect,which decreases the acidity.- In benzoic acid $(B)$,there is no substituent.- In $p$-nitrobenzoic acid $(D)$,the $-NO_{2}$ group exerts a strong $-I$ (inductive) and $-M$ effect,which stabilizes the carboxylate anion and significantly increases the acidity.Since $p$-nitrobenzoic acid is the strongest acid among the given options,it has the lowest $pK_{a}$ value.

Which of the following has the lowest $pK_{a}$ value?

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