Peeling of ozone umbrella is due to

Options

A. CFC
B. PAN
C. `CO_2`
D. Coal burning

Explanation

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the cause of the "peeling of the ozone umbrella." The ozone layer is crucial for protecting the Earth from harmful ultraviolet (UV) radiation.

2. **Identifying the Options**: The options provided are:
- A) CFC (Chlorofluorocarbons)
- B) PAN (Peroxyacetyl Nitrate)
- C) CO2 (Carbon Dioxide)
- D) Coil burning

3. **Analyzing Each Option**:
- **CFC (Chlorofluorocarbons)**: These are man-made compounds that have been found to deplete the ozone layer. They release chlorine atoms when they break down in the stratosphere, which leads to the destruction of ozone molecules.
- **PAN (Peroxyacetyl Nitrate)**: While it is a pollutant, it is not primarily responsible for ozone layer depletion.
- **CO2 (Carbon Dioxide)**: This is a greenhouse gas but does not directly affect the ozone layer.
- **Coil burning**: This refers to the burning of fossil fuels, which contributes to air pollution but is not a direct cause of ozone depletion.

4. **Conclusion**: Based on the analysis, the correct answer is **A) CFC (Chlorofluorocarbons)**, as they are the primary agents responsible for the thinning of the ozone layer.

5. **Explanation of the Mechanism**: CFCs release chlorine atoms in the stratosphere, which react with ozone (O3) and break it down into oxygen (O2), leading to the thinning or "peeling" of the ozone layer.

### Final Answer:
The peeling of the ozone umbrella is due to **CFC (Chlorofluorocarbons)**.

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