क्षोभमंडल पर ओजोन-परत के क्षय में होने वाली अभिक्रिया कौन सी है ?

In the stratosphere, ozone is a product of the action of $UV$ radiations on dioxygen as:

$(i){O_{2(g)}}\xrightarrow{{UV}}{O_{(g)}} + {O_{(g)}}$

$(ii){O_{2(g)}} + {O_{(g)}}\overset {UV} \longleftrightarrow {O_3}(g)$

Reaction $(ii)$ indicates the dynamic equilibrium existing between the production and decomposition of ozone molecules. Any factor that disturbs the equilibrium may cause depletion of ozone layer by its decomposition. One such factor is the release of chlorofluorocarbon compounds $(CFCs)$. These are non-reactive, non-flammable molecules that are used in refrigerators, air conditioners, plastics, and electronic industries.

Once released $CFCs$ mix with atmospheric gases and reach the stratosphere, where they are decomposed by $UV$ radiations.

$(iii)\,\,C{{F}_{2}}C{{l}_{2}}_{(g)}\xrightarrow{UV}{{\overset{\centerdot }{\mathop{Cl}}\,}_{(g)}}+\overset{\centerdot }{\mathop{C}}\,{{F}_{2}}C{{l}_{(g)}}$

The chlorine free radical produced in reaction $ (iii)$ reacts with ozone as:

$(iv)\,\,{{\overset{\centerdot }{\mathop{Cl}}\,}_{(g)}}+{{O}_{3(g)}}\to Cl{{\overset{\centerdot }{\mathop{O}}\,}_{(g)}}+{{O}_{2(g)}}$

${{\overset{\centerdot }{\mathop{Cl}}\,}_{(g)}}$

$Cl{{\overset{\centerdot }{\mathop{O}}\,}_{(g)}}+{{O}_{(g)}}\to {{\overset{\centerdot }{\mathop{Cl}}\,}_{(g)}}+{{O}_{2(g)}}$

The radicals further react with atomic oxygen to produce more chlorine radicals as:

$(v)$ The regeneration of causes a continuous breakdown of ozone present in the stratosphere, damaging $\dot{ C } 1_{( g )}$ the ozone layer.