Select the acid with the highest K_a (i.e.,lo | vedclass

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Question

(B) The acidic strength of carboxylic acids is directly proportional to the electron-withdrawing effect ($-I$ effect) of the substituents attached to

Vedclass · Accepted Answer

Dichloroacetic acid $(Cl_2CHCOOH)$

Vedclass · Answer

(B) The acidic strength of carboxylic acids is directly proportional to the electron-withdrawing effect ($-I$ effect) of the substituents attached to the carbon chain.$1$. Acetic acid $(CH_3COOH)$ has a $+I$ group $(CH_3)$,which decreases acidity.$2$. Dichloroacetic acid $(Cl_2CHCOOH)$ has two highly electronegative chlorine atoms,which exert a strong $-I$ effect,significantly stabilizing the carboxylate anion and increasing acidity.$3$. $4-$Iodocyclohexanecarboxylic acid and $4-$Chlorocyclohexanecarboxylic acid have the electron-withdrawing groups far from the carboxylic acid group,resulting in a much weaker $-I$ effect compared to dichloroacetic acid.Therefore,dichloroacetic acid is the strongest acid among the given options,meaning it has the highest $K_a$ and lowest $pK_a$ value.

Select the acid with the highest $K_a$ (i.e.,lowest $pK_a$).

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