Q. Which of the following acids does not exhibit optical isomerism?
A) Tartaric acid
B) Maleic acid
C) α-Amino acids
D) Lactic acid
Explanation
[Solution from source] Maleic acid (cis-HOOC–CH=CH–COOH) is planar with no chiral carbon, so it shows geometrical but not optical isomerism. Lactic acid, tartaric acid and α-amino acids (except glycine) have chiral carbons. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.