Which among the given acids has the lowest pK | vedclass

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(C) The $pKa$ value is inversely proportional to the acidic strength of the carboxylic acid. Acidic strength is increased by the presence of electron-

Vedclass · Accepted Answer

Nitroacetic acid

Vedclass · Answer

(C) The $pKa$ value is inversely proportional to the acidic strength of the carboxylic acid. Acidic strength is increased by the presence of electron-withdrawing groups $(EWG)$ due to the $-I$ effect. The strength of the $-I$ effect follows the order: $-NO_2 > -CN > -Cl > -Br$. Among the given options,the nitro group $(-NO_2)$ is the strongest electron-withdrawing group. Therefore,nitroacetic acid $((O_2N)-CH_2-COOH)$ is the strongest acid and has the lowest $pKa$ value.

Which among the given acids has the lowest $pKa$ value?

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