MHT CET Chemistry Question (2026) — Solution

Step-by-step solution

A Zwitter ion is a dipolar ion formed by the internal transfer of a proton from an acidic group to a basic group within the same molecule. Among the given options, NH _2 CH _2 COOH (glycine) is an amino acid that contains both an acidic carboxyl group (- COOH ) and a basic amino group (- NH _2). In aqueous solution, the - COOH group donates a proton to the - NH _2 group, forming the Zwitter ion ^ + NH _3 CH _2 COO ^ - . The other molecules lack either an acidic or a basic group required for this internal proton transfer. Answer: NH _2 CH _2 COOH