On monochlorination of $2-$ methyl butane, the total number of chiral compounds is
$2$
$4$
$6$
$8$
$2$-chlorobutane $+\mathrm{Cl}_2 \rightarrow \mathrm{C}_4 \mathrm{H}_8 \mathrm{Cl}_2$ (isomers)
Total number of optically active isomers shown by $\mathrm{C}_4 \mathrm{H}_8 \mathrm{Cl}_2$, obtained in the above reaction is......................
Number of optical isomers of lactic acid are
The number of optical isomers in following compound is:. . . . . .
The absolute configurations of the two centers in the following molecule are
Which of the following show optical isomersim