Which of the following agetns is responsible for generating chlorine radicals into stratosphere?

Options

A. Smog
B. `NO_(2)`
C. UV radiation
D. CFC

Answer

To determine which agent is responsible for generating chlorine radicals in the stratosphere, we can analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding the Options**:
- We have four options:
- A) Smog
- B) NO2 (Nitrogen Dioxide)
- C) UV Radiation
- D) CFC (Chlorofluorocarbons)

2. **Analyzing Smog**:
- Smog is a mixture of smoke and fog. It does not contain chlorine and is not known to generate chlorine radicals.
- **Conclusion**: Smog is not responsible for generating chlorine radicals.

3. **Analyzing NO2**:
- NO2 is a harmful gas that can contribute to acid rain but does not contain chlorine.
- **Conclusion**: NO2 is not responsible for generating chlorine radicals.

4. **Analyzing UV Radiation**:
- UV radiation is a form of energy that can cause chemical reactions, including the generation of free radicals. However, it does not contain chlorine itself.
- **Conclusion**: UV radiation does not directly generate chlorine radicals.

5. **Analyzing CFCs**:
- CFCs (Chlorofluorocarbons) are compounds that contain chlorine, fluorine, and carbon. When CFCs are exposed to UV radiation in the stratosphere, they break down and release chlorine radicals.
- **Conclusion**: CFCs are responsible for generating chlorine radicals in the stratosphere.

6. **Final Answer**:
- The correct option that is responsible for generating chlorine radicals into the stratosphere is **Option D: CFC**.