On the basis of chemical reactions involved, explain how do chlorofluorocarbons cause thinning of ozone layer is stratosphere ?

Explanation

Chlorofluorocarbons are stable compounds. They move to stratosphere by random diffusion. These undergo decomposition in the presence of sunlight to release Cl atoms. These Cl atoms cause catalytic chemical reactions and cause significant depletion of ozone layer as shown below:
`CF_2Cl_2 overset(hv)to Cl^(*) + CF_2 Cl^(*)`
`Cl^(*) + O_3 to ClO^(*) + O_2`
`ClO^(*) + O to Cl^(*) + O_2`