<unk>  was used as an intermediate in the manufacture of pesticides, particularly the fungicide pentachloronitrobenzene. Pentachloronitrobenzene is now made by the chlorination of nitrobenzene in order to avoid the use of<unk> .<unk>  was a component of a mixture of chlorobenzenes added to products containing polychlorinated biphenyls in order to reduce viscosity.<unk>  has also been used as a fire retardant.
Pentachlorobenzene
Coal tar
Vinyl chloride
Triphenylchloroethylene
Hexachlorobenzene
Butylated hydroxytoluene
Benzene
Polychlorinated biphenyl