Which pairs of the salts would have identical solubilities in methanol?

How many meso isomers of $C_4H_8Cl_2$ are possible?

The number of optical isomers of lactic acid is

Chirality of a carbon compound is because of its

If $n$ represents the total number of asymmetric carbon atoms in a compound,the possible number of optical isomers of the compound is-

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