Concept:Optical isomerism arises when a molecule contains a chiral carbon atom.
A chiral carbon is bonded to four different groups.
Such molecules exist as non-superimposable mirror images.
Explanation:Analyse the carbon atoms in the given compound.
Check whether any carbon atom is attached to four different atoms or groups.
The compound has such a carbon atom.
This makes the molecule asymmetric.
Therefore, the molecule can exist as two optical isomers.
These isomers are mirror images of each other.
They cannot be superimposed on each other.
This property is called optical isomerism.
It is not geometric or positional isomerism.
It is also not ordinary structural isomerism.
The key feature is the chiral centre.
So the compound exhibits optical isomerism.
Answer:D. Optical isomerism
