The maximum number of stereoisomers possible for 2-hydroxy- 2-methyl butanoic acid is
$1$
$2$
$3$
$4$
A solution of optically active $1$ -phenylethanol racemizes in acidified aqueous medium. It is due to
Which of the following acids does not exhibit optical isomerism?
Calculate enantiomeric excees of mixture containing $6g$ of $( +) - 2$ -butanol and $4g$ of $(-) - 2$ -butanol........$\%$
Number of optical isomers possible for $2$ - chlorobutane..........
Which of the following compounds are optically active