Addition of Halogens
Bromine and chlorine both add readily to aikenes to yield 1,2-dihaloalkenes.For example,approximately 6 million tone per year 1,2-dichloroethane (ethylene dichloride) are synthesized industrially by the addition of Cl2 to ethylene.The product is used both as a solvent and as starting meterial for use in the manufacture of poly(vinyl chloride),PVC