<unk>  (also called cyclohexatriene) is an organic chemical compound with the molecular formula C6H6. The<unk>  molecule is composed of six carbon atoms joined in a planar ring with one hydrogen atom attached to each.<unk> ecause it contains only carbon and hydrogen atoms,<unk>  is classed as a hydrocarbon.<unk>  is a natural constituent of crude oil and is one of the elementary petrochemicals. Due to the cyclic continuous pi<unk> onds<unk> etween the carbon atoms,<unk>  is classed as an aromatic hydrocarbon. It is sometimes abbreviated PhH.<unk>  is a colorless and highly flammable liquid with a sweet smell, and is partially responsible for the aroma around petrol (gasoline) stations. It is used primarily as a precursor to the manufacture of chemicals with more complex structure, such as ethylbenzene and cumene, of which<unk> illions of kilograms are produced annually. Although a major industrial chemical,<unk>  finds limited use in consumer items<unk> ecause of its toxicity.
Benzene
Nitrobenzene
Naphthalene
Vinyl chloride
Coal tar
Methanol
Alkylphenol
Triphenylchloroethylene