Among the following, achiral amino acid is:

ethylalanine

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methylglycine

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2-hydroxymethyl serine

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tryptophan

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Solution

The correct option is D 2-hydroxymethyl serine
2-hydroxymethyl serine is achiral amino acid as two same groups ( $- C H_{2} - O H$ groups) are attached to same $C$ atom. Ethylalanine, Methylglycine and Tryptophan are chiral amino acids.

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