Which of the following compounds does not exi | vedclass

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(D) zwitterion is a dipolar ion that contains both positive and negative charges,resulting in a net charge of zero. Amino acids like glycine and gluta

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$p-$Aminobenzoic acid

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(D) zwitterion is a dipolar ion that contains both positive and negative charges,resulting in a net charge of zero. Amino acids like glycine and glutamic acid exist as zwitterions because they contain both an acidic $(-COOH)$ and a basic $(-NH_2)$ group. Sulphanilic acid $(NH_2-C_6H_4-SO_3H)$ also exists as a zwitterion because the acidic $-SO_3H$ group transfers a proton to the basic $-NH_2$ group. However,$p-$Aminobenzoic acid $(NH_2-C_6H_4-COOH)$ does not exist as a zwitterion in its stable form because the acidity of the carboxylic acid group is not strong enough to protonate the weakly basic aniline group effectively in the solid state compared to the sulfonic acid group in sulphanilic acid.

Which of the following compounds does not exist as a zwitterion?

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