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Answer: 4. Glycine

A zwitterion needs both an acidic group and a basic group in the same molecule, so the proton moves from the acid to the base.

Glycine, \(\mathrm{NH_2CH_2COOH}\), has \(\mathrm{-COOH}\) and \(\mathrm{-NH_2}\), forming \(\mathrm{{}^+NH_3CH_2COO^-}\). Aniline and acetanilide have no acid group, and benzoic acid has no basic group.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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