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

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$HOCl (g) \to {OH}^{.} (g) + {Cl}^{.} (g)$

${CH}_{4} + 2 O_{3} \to 3 H_{2} C = O + 3 H_{2} O$

${CF}_{2} {Cl}_{2} (g) \overset{uv}{\to} {Cl}^{.} (g) + C^{.} F_{2} Cl (g)$

${ClO}^{.} (g) + O (g) \to {Cl}^{.} (g) + O_{2} (g)$

answer is C.

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Detailed Solution

The high stratosphere contains a significant amount of ozone, which shields humans from the sun's damaging UV rays. CFCs are the primary cause of depletion. When CFCs are discharged into the atmosphere, they combine with other atmospheric gases and eventually reach the stratosphere. They are broken down by intense UV radiations in the stratosphere, generating chlorine-free radicals. After that, the chlorine-free radical combines with stratospheric ozone to produce chlorine monoxide radicals and molecular oxygen. As a result, the interaction of methane with ozone does not occur. ${CH}_{4} + 2 O_{3} \to 3 H_{2} C = O + 3 H_{2} O$