dintro benzene is reduced in presence of Na2S2
Nitro benzene can be prepared by heating benzene with a 1:1 mixture of concentrated nitric acid and concentrated sulphuric acid at 50-55 degree Celsius.
From benzene? [Nitration (HNO3+H2SO4(cat.)) twice @ 0~4 degrees C] + [1 eq. H2 in Pd over C].