Chloroalkanes and CFCs

Alkanes can be chlorinated to create halogenoalkanes through a free-radical reaction.
Chlorofluorocarbons (CFCs) contribute to the ozone hole due to their ability to catalyse the decomposition of ozone.
Use of CFCs has been banned due to their harmful impact on the ozone layer.
The key example for this mechanism is the reaction of methane with chlorine.