Question

State how CFCs break ozone in the stratosphere.

Answer 1

Depletion of 0₃ (ozone) by CFCs:

CFC [CFCl₃ ] is broken by UV of sunlight to produce [Cl] atom or free radical [Cl] which highiy reactive in the atomic form and forms C10[g] with O₂ 

\[\ce{CFCl3 ->[UV(Sum)] CFCl2 + Cl [atom]}\]

C l [g] + O₃[g] → ClO[g] + O₂[g]
This depletes ozone.

CIO further produces more [Cl] free radical
Cl0[g] + O[g] → Cl[g] O₂[g] and destroys more of O₃ and there by giving rise of ozone depletion.