# How do chlorofluorocarbons destroy ozone?

May 14, 2018

UV radiation in the atmosphere causes an initial bond cleavage that creates free radical centres.....

#### Explanation:

UV induced cleavage of the C-Cl bond in the chlorofluorocarbon molecule forms a free radical centre in the molecule plus a chlorine atom. The chlorine atom reacts with ozone to form oxygen and Cl-O.

Cl + O_3→ClO + O_2

Cl-O also is able to react with ozone, thereby removing another oxygen atom plus a chlorine atom.....

ClO + O.→Cl + O_2

And the oxygen atom can then react with ozone to form more oxygen (molecules).

O_3 + O.→ 2O_2

So not only can CFC's in the atmosphere react with and depelet ozone, but they react so as to cause the formation of other species that also react with and deplete ozone.

As a result, a single CFC molecule can cause the breakdown of thousands of ozone molecules.