Question

Ozone in the stratosphere is depleted by:

Options

• CF₂Cl₂

• C₆F₆

• C₆F₁₆

• C₆H₆C_l6

Answer 1

CF₂Cl₂ 

Explanation:

Ozone in stratosphere is depleted by chlorofluoro carbons such as CF₂Cl₂ (Freon).

In the stratosphere CFCs are cleaved by UV radiation from sun.

\[\ce{CD2Cl2 ->[UV] \overset{\bullet}{C}F2Cl + \overset{\bullet}{C}l}\]

\[\ce{\overset{\bullet}{C}l + O3 -> Cl\overset{\bullet}{O} + O2}\]

\[\ce{Cl\overset{\bullet}{O} + O3 -> \overset{\bullet}{C}l + 2O2}\]