Haloalkane

Haloalkane also called as alkyl halides are a group of chemical compound that consist of alkane..Some famous example of alkane are methane,alkane,octane and others..haloalkane can ce derived from alkana.We can subsitude one hydrogen with a halogen atom to convert alkana to alkane..Chlorofluorocarbons (CFC) are compounds containing chlorine,fluorine and carbon only, that is they contain no hydrogen.It is commonly used in our daily lives such as refrigerants , propellants, and cleaning solvents.Hydrochlorofluorocarbons (HCFCs) are of a class of haloalkanes where not all hydrogen has been replaced by chlorine or fluorine. They are used primarily as chlorofluorocarbon (CFC) substitutes, as the ozone depleting effects are only about 10% of the CFCs.Hydrofluorocarbons (HFCs) contain no chlorine. They are composed entirely of carbon, hydrogen, and fluorine. They have no known effects at all on the ozone layer. Only compounds containing chlorine and bromine are thought to harm the ozone layer.Chlorinated or fluorinated alkenes can be used for polymerization, resulting in polymer haloalkanes with notable chemical resistance properties.

for more information,you may go to http://en.wikipedia.org/wiki/Haloalkane#Environmental_issues