<unk>  is an aromatic organic compound with the chemical formula C6H5Cl. It is a colorless, flammable liquid first made in 1851 by reacting phenol and phosphorus pentachloride.[citation needed]
Chlorobenzene
Benzene
Nitrazine
Trichloroethylene
Vinyl chloride
Toluene
Dimethylphthalate
Coal tar