C.l + O3 → Cl.O + O2(g) this reaction is the cause for
Ozone hole
In stratosphere CFC's get broken down by powerful UV radiation, releasing free radical
CF2Cl2 UV→ .Cl(g) + F2Cl(g)
The chlorine radical then react with stratosphere ozone to form O radicals and O2
.Cl + O3 → Cl.O + O2