Discussion
Factor for depletion of ozone layer is
Answer: A
The main factor is chlorofluorocarbon.
CFCs, once used in refrigerators, air conditioners and aerosol sprays, are stable enough to reach the stratosphere. There ultraviolet light breaks them up and releases chlorine atoms, each of which can destroy many thousands of ozone molecules in a chain reaction. They are being phased out under the Montreal Protocol of 1987.
Chloroform, acetaldehyde and benzene are pollutants and solvents but are not the main cause of ozone depletion.
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