Search any question & find its solution
Question:
Answered & Verified by Expert
Among the following compounds, which one is not responsible for depletion of ozone layer?
Options:
Solution:
1393 Upvotes
Verified Answer
The correct answer is:
$\mathrm{CH}_4$
In stratosphere the following reactions takes place which are responsible for depletion of ozone layer.
$\begin{aligned} & \mathrm{NO}+\mathrm{O}_3 \longrightarrow \mathrm{NO}_2+\mathrm{O}_2 \\ & \mathrm{CF}_2 \mathrm{Cl}_2 \stackrel{h v}{\longrightarrow} \dot{\mathrm{C}} \mathrm{F}_2 \mathrm{Cl}+\dot{\mathrm{Cl}} \\ & \mathrm{CFCl}_3 \stackrel{h v}{\longrightarrow} \dot{\mathrm{C}} \mathrm{FCl}_2+\dot{\mathrm{C}} \mathrm{l} \\ & \dot{\mathrm{C}} 1+\mathrm{O}_3 \longrightarrow \mathrm{Cl} \dot{\mathrm{O}}+\mathrm{O}_2 \\ & \mathrm{Cl} \dot{\mathrm{O}}+\mathrm{O} \longrightarrow \dot{\mathrm{C}}+\mathrm{O}_2 \\ & \end{aligned}$
Hence, methane $\left(\mathrm{CH}_4\right)$ is not responsible for ozone layer depletion.
$\begin{aligned} & \mathrm{NO}+\mathrm{O}_3 \longrightarrow \mathrm{NO}_2+\mathrm{O}_2 \\ & \mathrm{CF}_2 \mathrm{Cl}_2 \stackrel{h v}{\longrightarrow} \dot{\mathrm{C}} \mathrm{F}_2 \mathrm{Cl}+\dot{\mathrm{Cl}} \\ & \mathrm{CFCl}_3 \stackrel{h v}{\longrightarrow} \dot{\mathrm{C}} \mathrm{FCl}_2+\dot{\mathrm{C}} \mathrm{l} \\ & \dot{\mathrm{C}} 1+\mathrm{O}_3 \longrightarrow \mathrm{Cl} \dot{\mathrm{O}}+\mathrm{O}_2 \\ & \mathrm{Cl} \dot{\mathrm{O}}+\mathrm{O} \longrightarrow \dot{\mathrm{C}}+\mathrm{O}_2 \\ & \end{aligned}$
Hence, methane $\left(\mathrm{CH}_4\right)$ is not responsible for ozone layer depletion.
Looking for more such questions to practice?
Download the MARKS App - The ultimate prep app for IIT JEE & NEET with chapter-wise PYQs, revision notes, formula sheets, custom tests & much more.