Which of the following exhibits optical isomerism?

When does a given organic compound exhibit optical activity?

Which of the following will show optical isomerism?

The structural formula of sativene is shown below. How many stereogenic centers are there in this molecule?

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