4-Nitrochlorobenzene is heated with Na/ether 4-Nitrolodobenzene is heated with copper powder in a seated tube diphenyl is heated with a MIXTURE of conc. `HNO_(3)` and conc. `H_(2)SO_(4)` nitrobenzene is treated with 4-nitrochlorobenzene in PRESENCE of anhyd. `AlCl_(3)`