Nitrobenzenes are a group of nitro compounds consisting of one or more nitro groups as substituents on a benzene core. They have the formula C<sub>6</sub>H<sub>6âÂÂn</sub>(NO<sub>2</sub>)<sub>n</sub>, where n = 1âÂÂ6 is the number of nitro groups. Depending on the number of nitro groups, there may be several constitutional isomers possible.