Due to the ready homolytic fission of the C Cl bond to create chlorine radicals in the upper atmosphere, chlorofluorocarbons have been phased out due to the harm they do to the ozone layer.
2.
The important point is CH 4 becomes vibrationally excited as a result of the collision with M . Vibrational excitation ( " chemical activation " ) is often necessary for a chemical reaction, such as the homolytic fission of a C H bond:
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