Which of the following is true about freons?

Options

A. (1) These are radicals of chlorine and chlorine monoxide
B. These are chlorofluorocarbon compounds
C. All radicals are called freons
D. These are chemicals causing skin cance

Answer

To solve the question "Which of the following is true about freons?", we will analyze each of the provided statements regarding freons systematically.

### Step-by-Step Solution:

1. **Understanding Freons**:
- Freons are a class of compounds known as chlorofluorocarbons (CFCs). They are composed of carbon, chlorine, and fluorine atoms.

2. **Analyzing Statement 1**:
- **Statement**: "These are the radicals of chlorine and chlorine monoxide."
- **Evaluation**: This statement is incorrect. Freons are not radicals; they are stable compounds that contain carbon, chlorine, and fluorine.

3. **Analyzing Statement 2**:
- **Statement**: "These are chlorofluorocarbon compounds."
- **Evaluation**: This statement is correct. Freons are indeed chlorofluorocarbon compounds.

4. **Analyzing Statement 3**:
- **Statement**: "All radicals are called freons."
- **Evaluation**: This statement is incorrect. Freons are specific compounds and not all radicals are classified as freons. While freons can break down into radicals when exposed to UV light, they themselves are not radicals.

5. **Analyzing Statement 4**:
- **Statement**: "These are the chemicals causing skin cancer."
- **Evaluation**: This statement is somewhat misleading. Freons themselves do not directly cause skin cancer, but they contribute to ozone layer depletion. The depletion of the ozone layer allows more UV radiation to reach the Earth's surface, which can increase the risk of skin cancer. Thus, this statement is also considered correct in the context of the effects of freons.

### Conclusion:
- The correct statements about freons are:
- **Statement 2**: "These are chlorofluorocarbon compounds."
- **Statement 4**: "These are the chemicals causing skin cancer." (indirectly through ozone depletion)

### Final Answer:
- The true statements about freons are statements 2 and 4.