MCQ Detailed View

The ozone layer is a protective layer in the Earth's stratosphere that absorbs most of the harmful ultraviolet (UV) radiation from the sun. Chlorofluorocarbons (CFCs) are synthetic compounds that were widely used in refrigerators, air conditioners, aerosol sprays, and foam production. CFCs are stable in the lower atmosphere but break down under UV radiation in the stratosphere, releasing chlorine atoms.

These chlorine atoms react with ozone (O₃) molecules, converting them into oxygen (O₂) and destroying the ozone layer. Even a single chlorine atom can destroy thousands of ozone molecules, which significantly weakens the protective layer and increases the risk of skin cancer, cataracts, and environmental damage.

Other options are incorrect. CH₃COOH (acetic acid) does not affect the ozone layer, and “Both A & B” or “None of these” are also wrong. Only CFCs are responsible for large-scale ozone depletion.

The discovery of the ozone hole over Antarctica in the 1980s highlighted the severe environmental impact of CFCs. International agreements like the Montreal Protocol were adopted to phase out CFC production and reduce ozone layer damage.

Understanding the role of CFCs in environmental chemistry is important for students studying atmospheric science, chemistry, and environmental protection. The chemistry of CFCs illustrates how human-made compounds can affect natural atmospheric processes and emphasizes the importance of sustainable practices.

Thus, CFCs are the main compounds responsible for destroying the ozone layer, making them a key topic in environmental chemistry and global ecological studies.