The lactic acid molecule has:

Among the following,the optically inactive compound is

Enantiomers cannot be distinguished by which of the following?

Number of optical isomers possible for $2$-chlorobutane is:

Which one of the following exhibits enantiomerism?

Solutions of optically active isomers rotate the plane of polarized light in a polarimeter. Match the following columns $(I)$ with $(II), (III)$,and $(IV)$ correctly:

$(I)$ Optical Activity	$(II)$ Form	$(III)$ Sign	$(IV)$ Rotation
$(A)$ Dextrorotatory	$d$	$(+)$	Right
$(B)$ Laevorotatory	$l$	$(-)$	Left
$(C)$ Optically Inactive (Racemic)	$dl$	$(\pm)$	Zero rotation