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Answer: (d) glycine

Glycine is H2N–CH2–COOH. Its α-carbon carries two hydrogen atoms, so it does not have four different groups and is not a chiral centre. Glycine is therefore optically inactive; all the other α-amino acids listed have a chiral α-carbon.

Doubtly AI · 29 Oct 2026 AI-verified · Nov 2026 Report
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