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Which of the following compounds can form a zwitterion?

1. Aniline
2. Acetanilide
3. Glycine
4. Benzoic acid

Correct answer: Glycine

Solution

Glycine, being an amino acid, contains both an amino group (-NH2) and a carboxylic acid group (-COOH). In aqueous solution, it can form a zwitterion where the amino group is protonated (-NH3+) and the carboxylic group is deprotonated (-COO-).

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