The number of chiral centers present in the given compound is:

Non-superimposable mirror images are called.........

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 is meant by configuration in an organic compound? What is meant by the reflection of a configuration?

The maximum number of stereoisomers possible for $2-$hydroxy$-2-$methylbutanoic acid is

The total number of stereoisomers that can exist for $M$ is:
$M$ is a bicyclic ketone with a methyl group at the bridgehead and two methyl groups at the bridge carbon.