Chlorinated hydrocarbons form a group of organic compounds and a subgroup of halogenated hydrocarbons. The chlorinated hydrocarbons are divided into chlorinated alkanes, chlorinated alkenes and aromatic chlorinated hydrocarbons. On the one hand, their chemical properties make them indispensable for industry, on the other hand, they usually have a great potential to be harmful to the environment. | Important chlorinated hydrocarbons include methyl chloride, dichloromethane and trichloromethane.