Problem: The steady-state stratospheric ozone concentration, which is determined by a balance between photochemical production and dissociation, has been offset by the presence of long-lived chlorofluorocarbons (CFCs) released in the troposphere through anthropogenic activity. According to the following mechanism, ozone depletion requires ________ radiation to initiate a chain reaction in which ________ serves as the catalyst.CFCl3 + hν → CFCl2• + Cl•Cl• + O3 → ClO• + O2ClO•+ O3 → Cl• + 2 O2 A. Infrared, chlorine atomsB. Ultraviolet, chlorine atomsC. Infrared, chlorine monoxideD. Ultraviolet, chlorine monoxideE. Ultraviolet, CFCl3

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We’re being asked to determine the required radiation and the catalyst to initiate the ozone depletion chain reaction.


Given mechanism:

CFCl3 + hν → CFCl2 + Cl
Cl + O3 → ClO + O2
ClO
 + O3 → Cl + 2 O2


We’re starting out with the compound CFCl3 and Let’s see what happens during ozone depletion:

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Problem Details

The steady-state stratospheric ozone concentration, which is determined by a balance between photochemical production and dissociation, has been offset by the presence of long-lived chlorofluorocarbons (CFCs) released in the troposphere through anthropogenic activity. According to the following mechanism, ozone depletion requires ________ radiation to initiate a chain reaction in which ________ serves as the catalyst.

CFCl3 + hν → CFCl2• + Cl•

Cl• + O3 → ClO• + O2

ClO•+ O3 → Cl• + 2 O2

A. Infrared, chlorine atoms

B. Ultraviolet, chlorine atoms

C. Infrared, chlorine monoxide

D. Ultraviolet, chlorine monoxide

E. Ultraviolet, CFCl3

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