Which one is responsible for depletion of ozone layer in the upper strata of the atmosphere?

Options

A. Ferrocene
B. Fullerenes
C. Freons
D. Polyhalogens

Answer

To determine which substance is responsible for the depletion of the ozone layer in the upper strata of the atmosphere, we can analyze the options provided: ferrocene, fulrenes, freons, and polyhalogens.

### Step-by-Step Solution:

1. **Understanding Ozone Layer**:
- The ozone layer is a region in the Earth's stratosphere that contains a high concentration of ozone (O3) molecules. It is located approximately 15 to 35 kilometers above the Earth's surface.
- The ozone layer is crucial as it protects the Earth from harmful ultraviolet (UV) radiation from the Sun.

**Hint**: Remember that the ozone layer absorbs UV radiation, which is essential for life on Earth.

2. **Identifying the Depleting Agents**:
- Various substances can affect the ozone layer, but we need to identify which of the given options is known for causing ozone depletion.
- Chlorofluorocarbons (CFCs) are well-documented as the primary agents responsible for ozone depletion.

**Hint**: CFCs are commonly found in products like refrigerants, aerosol sprays, and solvents.

3. **Analyzing the Options**:
- **Ferrocene**: This is an organometallic compound containing iron and does not have any known effect on the ozone layer.
- **Fulrenes**: These are allotropes of carbon and are not associated with ozone depletion.
- **Freons**: Freons are a type of chlorofluorocarbon (CFC) and are known to deplete the ozone layer. They release chlorine atoms when they break down in the stratosphere, which then react with ozone (O3) molecules.
- **Polyhalogens**: These compounds contain multiple halogens but are not specifically known for ozone depletion like CFCs.

**Hint**: Focus on the chemical nature of each option and their known environmental impacts.

4. **Conclusion**:
- Among the options provided, **freons** (which are chlorofluorocarbons) are responsible for the depletion of the ozone layer in the upper strata of the atmosphere.

**Final Answer**: Freons are responsible for the depletion of the ozone layer.