AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
(B) Chlorofluorocarbons (CFCs)
CFCs, used as refrigerants and in fire extinguishers, are the synthetic chemicals primarily responsible for the depletion of the ozone layer.
The textbook (Chapter 13) explicitly states that the decrease in ozone levels "has been linked to synthetic chemicals like chlorofluorocarbons (CFCs)." DDT is a pesticide, CO₂ causes global warming, and SO₂ causes acid rain — none deplete the ozone layer.