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Question:

Which of the following elements will reduce the stability of the ozone depletion organic refrigerant compounds?

A Chlorine & Bromine
Explaination

Chlorine and Bromine are responsible for the depletion of the ozone layer in the stratosphere. CFC compounds are highly stable in the lower atmospheres and have a higher lifetime. Therefore, they reach the stratosphere and deplete the ozone layer. The presence of Hydrogen elements in organic refrigerants such as HCFCs and HFCs results in decomposition at lower atmosphere. Therefore, these elements have a lower lifetime and cannot pose a threat to ozone depletion.