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The reaction that is NOT involved in the ozone layer depletion mechanism in the stratosphere is:

1. ClO(g) + O(g) -> Cl(g) + O2(g)
2. CF2Cl2(g) --hv--> Cl(g) + CF2Cl(g)
3. CH4 + 2O3 -> 3CH2 = O + 3H2O
4. HOCl(g) --hv--> OH(g) + Cl(g)

Correct answer: CH4 + 2O3 -> 3CH2 = O + 3H2O

Solution

ClO+O->Cl+O2, CF2Cl2 photolysis to Cl, and HOCl photolysis to OH+Cl are all genuine ozone-depletion steps. The reaction CH4 + 2O3 -> 3CH2=O + 3H2O (also unbalanced/fictitious) is not part of the mechanism.

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