Answer:
Chlorofluorocarbons are introduced into
the atmosphere from aerosol sprays in which they function as propellants and from
refrigerating equipments in which they act as coolants. They are also used as
solvents. They have very long life and stay in atmosphere for years and
ultimately reach the upper layer (stratosphere) where they decompose in
presence of UV-radiations of the sun. On account of decomposition, chlorine
atoms or free radicals.
\[C{{F}_{2}}C{{l}_{2}}\xrightarrow{hv}{{\,}^{\centerdot
}}C{{F}_{2}}Cl+C{{l}^{\centerdot }}\]
The active chlorine atoms then destroy
the ozone layer.
\[C{{l}^{\centerdot
}}+{{O}_{3}}\to Cl{{O}^{\centerdot }}+{{O}_{2}}\]
\[Cl{{O}^{\centerdot
}}+O\to C{{l}^{\centerdot }}+{{O}_{2}}\]
It has been found that one
molecule of chlorofluorocarbon can destroy one thousand \[{{O}_{3}}\] molecules
in the stratosphere.
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