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Question

The following reactions occur in the stratosphere:

A
O2+UVO+O
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B
O2+OO3
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C
Cl+O3ClO+O2
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D
SO3+H2OH2SO4
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Solution

The correct options are
B O2+UVO+O
C O2+OO3
D Cl+O3ClO+O2
In the stratosphere, ultraviolet light reacts with O2 molecules to form atomic oxygen. Atomic oxygen then reacts with an O2 molecule to produce ozone (O3). As a result of this reaction, the stratosphere contains an appreciable concentration of ozone molecules that constitutes the ozone layer.
Volatile organic compounds that contain chlorine and fluorine, which are known as chlorofluorocarbons (CFCs), are capable of reaching the stratosphere, where they can react with ultraviolet light to generate chlorine atoms and other chlorine-containing species that catalyze the conversion of ozone to O2, thereby decreasing the amount of O3 in the stratosphere.

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