Mixed chloro fluoro carbons, sometimes called CFC, such as CFCl 3 , CF 2 Cl 2 , CF 3 Cl are known as "Freons".
They are unreactive and are widely used as
refrigeration fluids. Freons are very much more
effective "greenhouse gases " in the atmosphere than
CO 2 ; though the amount of freons present is extremely small. Much more seriously, the freons have penetrated
the upper atmosphere and causing damage to the ozone
layer.
(i) In which of the following way freons damage the ozone layer ?
Text Solution
Verified by ExpertsCHECK THE SOLUTION.
(i)
Sol.In the upper atmosphere freons undergo photolytic reaction and yield chlorine free radicals.
Freons 
Cl 
Chlorine free radicals reacts with ozone and produce ClO 
The ClO 
formed decompose slowly, reforming Cl 
The Cl 
react further O 3 molecules.
(ii)
Sol. Chlorine free radicals combine with oxygen to
produce poisonous ClO 2
(iii)
Sol. The hydrogen atoms in HFCs and HCFs are attacked by hydroxyl radicals in upper atmosphere, producing trifluoro acetic acid. The CF 3 COOH is not so toxic, removed from the atmosphere during raining and in soil CF 3 COOH is destroyed by the bacteria.
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