Which one of the following is responsible for depletion of the...

Freons are chlorine containing gas. On exposure to UV rays in the upper part of atmosphere, Freon dissociates to give free chlorine radicals, which result in depletion of $\mathrm{O}_3$ layer. Related Theory Freon is a non-combustible gas, used as a refrigerant in air conditioning applications. It undergoes an evaporation process over and over again to help produce cool air that can be circulated throughout the AC system.