Benzene reacts with Br2 in the presence of FeBr3 (Friedel-Crafts halogenation) to give bromobenzene.
Bromobenzene on nitration with HNO3/H2SO4 gives a mixture of ortho-bromonitrobenzene and para-bromonitrobenzene (since −Br is an ortho/para director).
The two products (B and C) are separated by fractional distillation method due to their different boiling points.
