Only achiral amino acid is (RJ Pre PG 2016)

✅Explanation: An achiral molecule is one that is superimposable on its mirror image. Glycine is the only amino acid that lacks a chiral carbon atom (a carbon atom with four different groups attached), making it achiral.

📌 Other Options Explanations:
-Option A: Phenylalanine is an essential amino acid with a chiral carbon.
-Option B: Serine is a non-essential amino acid with a chiral carbon.
-Option D: Glutamic acid is a non-essential amino acid with a chiral carbon.