Mark the incorrect statement about chlorofluorocarbons.

Options

A. The balance between the production and degradation of ozone has been affected by CFCs.
B. CFCs are commonly used as refrigerants .
C. CFCs are broken down into Cl atoms by UV rays in the troposphere , from where they travel upwards to the stratosphere and degrade the ozone layer.
D. Cl atoms act as catalysts in the reaction, therefore they do not get consumed and continue to affect the ozone level.

Answer

To solve the question regarding the incorrect statement about chlorofluorocarbons (CFCs), we will analyze each statement provided in the options.

### Step-by-Step Solution:

1. **Understanding Chlorofluorocarbons (CFCs)**:
- CFCs are chemical compounds commonly used in refrigeration and air conditioning. They are known for their role in ozone layer depletion.

2. **Evaluating the Statements**:
- **Statement 1**: "The balance between the production of ozone has been affected by CFC."
- This statement is **correct**. Increased CFC levels lead to ozone layer depletion, disrupting the natural balance of ozone production and destruction.

- **Statement 2**: "CFCs are commonly used as refrigerators and ACs."
- This statement is also **correct**. CFCs have historically been used as refrigerants in cooling systems.

- **Statement 3**: "CFCs are broken down into chlorine atom by UV rays in the troposphere from where they travel upward to stratosphere and degrade the ozone layer."
- This statement is **incorrect**. CFCs do not break down in the troposphere; they are stable and travel directly to the stratosphere, where they are broken down by UV radiation, releasing chlorine atoms that deplete ozone.

- **Statement 4**: "The chlorine atoms act as a catalyst in the reaction. Therefore, they do not get consumed and continue to affect the ozone level."
- This statement is **correct**. Chlorine acts as a catalyst, meaning it can deplete ozone without being consumed in the process.

3. **Conclusion**:
- The incorrect statement is **Statement 3**.

### Final Answer:
The incorrect statement about chlorofluorocarbons is: **CFCs are broken down into chlorine atom by UV rays in the troposphere from where they travel upward to stratosphere and degrade the ozone layer.**

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