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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) + O 2 (g)
2. CF 2 Cl 2 (g) ⎯→ ⎯ uv Cl(g) + CF 2 Cl(g)
3. CH 4 + 2O 3 → 3CH 2 = O + 3 H 2 O
4. HOCl(g) ⎯→ ⎯ ν h OH(g) + Cl(g)

Correct answer: CH 4 + 2O 3 → 3CH 2 = O + 3 H 2 O

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