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NEET 2004 Chemistry question

ChemistryHaloalkanes and HaloarenesNEET 2004

Which of the following is responsible for depletion of the ozone layer in the upper strata of the atmosphere :-

Answer: (3)

Solution

Freons (chlorofluorocarbons, e.g. ) are inert in the troposphere and reach the stratosphere, where UV radiation breaks the C-Cl bond to give chlorine free radicals; these catalytically destroy ozone: $Cl· + O_3

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Question ID VK-089394