Calculate enantiomeric excees of mixture containing $6g$ of $( +) - 2$ -butanol and $4g$ of $(-) - 2$ -butanol........$\%$
$10$
$20$
$40$
$33$
Which one of the following acids does not exhibit optical isomerism?
Total number of substituent present in the above compound
Relation between $(A)$ and $(B)$ is
Which is the correct structure of $D$ -glyceraldehyde ?
Rotation of plane polarised light is measured by