Determine the absolute configurations of the chiral centres in the following compound.

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

What are the optical isomers called that are not mirror images of each other?

Which of the following compounds is not chiral?

The separation of a racemic mixture into pure enantiomers is termed as

In which of the following properties do the two enantiomers of lactic acid differ from each other?