Question

Match the compounds/reactions in column I with their correct number of isomers in column II. Matching can be one or more than one.

Answer 1

In $A$ as all positions are same so only one isomer forms for mono substituted.
In $B$, three isomers are forms and only $1,4$ disubstituted is optical isomer.
In $C$, three isomers are possible and only $1,2$ disubstituted is optically inactive
In case of benzene ,$3$ isomers will be form and all are optically active.