The number of optical isomers for the compound $CH_3-CH(OH)-CH(Cl)-CH_2-COOH$ is:

What is the process of separating a racemic mixture into pure $(+)$ and $(-)$ enantiomers called?

Which of the following is not optically active?

Which of the following are enantiomers?

The number of chiral centers present in the given compound is:

Optical activity of an enantiomeric mixture is $+12.6^{\circ}$ and the specific rotation of the $(+)$ isomer is $+30^{\circ}$. The optical purity is $......... \%$.