9701 MCQ Solution 25

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Question 25: [Organic > Halogen Derivatives]:
Chlorofluorocarbons (CFCs) have been widely used in aerosol sprays, refrigerators and in making foamed plastics, but are now known to destroy ozone in the upper atmosphere.

Which of the following will not destroy ozone, and therefore can be used safely as a replacement for CFCs?

A CHBr3
B CCl3CBr3
C CHClFCClF2
D CH3CH2CH2CH3

Reference: Past Exam Paper – November 2002 Paper 1 Q25



Solution 25:

Answer: D.
Options A, B and C are incorrect because they contain halogen derivatives and may homolytically break down forming halogen free radicals that will react and break down the ozone layer. 
Option D is butane which is completely inert so will not affect the ozone.

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