A) Glycine
B) Glutamic acid
C) Sulphanilic acid
D) p-aminobenzoic acid
Correct Answer: D
Solution :
\[o-\] and p - aminobenzoic acids do not exist as a Zwitter ion. The lone pair of electrons on the \[-N{{H}_{2}}\] group is donated towards the benzene ring due to resonance effect. As a result, acidic character of \[-COOH\] group and basic character of \[-N{{H}_{2}}\] group decrease. Therefore, the weakly acidic \[-COOH\] group cannot transfer a \[{{H}^{+}}\] ion to the weakly basic \[-N{{H}_{2}}\] group. Thus o-or p-aminobenzoic acids do not exist as Zwitter ion.
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