Which of the following is optically active

Options

A. Ethylene glycol
B. Oxalic acid
C. Glycerol
D. Tartaric acid

Answer

D

Explanation

`underset(H-underset(OH)underset(|)C-COOH)underset(|)(H-overset(OH)overset(|)C-COOH)`
It is a mesocompound which is optically inactive due to internal compensation but the answer is “d” itself.