Question 31 - 2019 (10 Jan Shift 2)

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

(1) $\text{CF}_2\text{Cl}_2(\text{g}) \xrightarrow{\text{UV}} \dot{\text{Cl}}(\text{g}) + \dot{\text{C}}\text{F}_2\text{Cl}(\text{g})$

(2) $\text{ClO}(\text{g}) + \text{O}(\text{g}) \longrightarrow \dot{\text{Cl}}(\text{g}) + \text{O}_2(\text{g})$

(3) $\text{CH}_4 + 2\text{O}_3 \longrightarrow 3\text{CH}_2 = \text{O} + 3\text{H}_2\text{O}$

(4) $\text{HOCl}(\text{g}) \xrightarrow{h\nu} \dot{\text{O}}\text{H}(\text{g}) + \dot{\text{Cl}}(\text{g})$