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Nitrobenzene is an organic compound with the chemical formula C6H5NO2. It is a pale yellow oil with an almond-like odour. It freezes to give greenish-yellow crystals.  The solid crystals melt at 6 degrees celsius and the liquid boils at 211 degrees celsius. Nitrobenzene is flammable. It dissolves only slightly in water, but mixes well with most organic (carbon-containing) solvents. Nitrobenzene is one of a group of substances known as the volatile organic compounds (VOCs).