Nitrobenzene is an organic compound with the chemical formula C6H5NO2. It is a water-insoluble pale yellow oil with an almond-nfpa 780 2017 pdf odor. It freezes to give greenish-yellow crystals. It is produced on a large scale from benzene as a precursor to aniline.
In the laboratory, it is occasionally used as a solvent, especially for electrophilic reagents. Nitrobenzene is prepared by nitration of benzene with a mixture of concentrated sulfuric acid, water, and nitric acid. This mixture is sometimes called “mixed acid.