In a reaction of `C_(6)H_(5)Y` the major product `(gt60%)` is `m`-isomer, so the group `Y` is

Benzene and other aromatic hydrocarbons, though contain pi -bonds, yet they behave as saturated hydrocarbons. They are stable because of delocalisation of cloud. These undergo electrophilic substitution reactions as : C_(6)H_(5)-H + YZ to C_(6)H_(5)Y +HZ The reactivity of aromatic hydrocarbons towards electrophilic substitution depends upon the electron density in the benzene ring In the reaction of C_(6)H_(5)Y , the major product is m-isomer. The group Y may be

The major product (Y) of the following reactions is

The major product ' Y ' in the following reaction is

The major product ' Y ' in the following reaction is