question_answer

Which of the following compounds can form a Zwitter ion?

A) Benzoicacid

B) Acetanilide

C) Aniline

D) Glycine

Correct Answer: D

Solution :

[d]

Ion containing positive as well as negative charge is called Zwitter ion.

Among the given options, only glycine \[({{H}_{2}}NC{{H}_{2}}COOH)\] is an amino acid which contains both acidic (acquiring negative charge) and basic group (acquiring positive charge).

Therefore, glycine can form a Zwitter ion. It is because glycine behave like salt rather than simple amines or carboxylic acids. In aqueous solution, the carboxyl group can lose a proton and amino group can accept a proton giving rise to a dipolar ion known as Zwitter ion.