How is ozone layer depleted by chlorofluorocarbons (CFCs) ? Describe with chemical equation.

The molecular formula of ozone layer is O₃.
The molecular formula of chlorofluorocarbon derived from an alkane CnH₂₍n₊₁₎ is 

CnCl₍₂n₊₂-w₎Fw

For n=1 and w=2 

The molecular formula of chlorofluorocarbon is

CCl₂F₂