VITEEE 2019 Paper

2R, 3 S- 2, 3- butanediol
⇒ The compound is optically inactive even though it has 2 chiral carbons because of 2R and 3S.
So, the structure should be symmetry in order to be optically inactive.
⇒ They are symmetric.
clockwise direction ⇒R
Anti-clockwise ⇒S