Freons are not recommended to be used in refrigerators because they

Options

A. cause global warming
B. cause acid rain
C. cause depletion of ozone layer
D. cause very less cooling

Explanation

### Step-by-Step Solution:

1. **Understanding Freons**: Freons are a group of chemicals known as chlorofluorocarbons (CFCs). They were commonly used as refrigerants in refrigerators and air conditioning systems.

2. **Ozone Layer Depletion**: The primary reason Freons are not recommended for use in refrigerators is that they contribute to the depletion of the ozone layer. The ozone layer is crucial for protecting the Earth from harmful ultraviolet (UV) radiation from the sun.

3. **Chemical Reaction**: When Freons are released into the atmosphere, they eventually reach the stratosphere, where they are broken down by UV radiation. This process releases chlorine atoms, which can react with ozone (O3) molecules.

4. **Formation of Free Radicals**: The breakdown of Freons leads to the formation of free radicals, such as chlorine (Cl) and bromine (Br). These free radicals are highly reactive and can destroy ozone molecules.

5. **Ozone Destruction Cycle**: One chlorine atom can destroy thousands of ozone molecules before it is removed from the atmosphere. The reaction can be summarized as follows:
- Cl + O3 → ClO + O2
- ClO + O → Cl + O2
This cycle continues, leading to significant depletion of the ozone layer.

6. **Environmental Impact**: The depletion of the ozone layer allows more UV radiation to reach the Earth's surface, which can lead to increased skin cancer rates, cataracts, and other environmental issues.

7. **Regulations**: Due to the harmful effects of Freons on the ozone layer, their use has been restricted and phased out under international agreements like the Montreal Protocol.

### Conclusion:
Freons are not recommended for use in refrigerators because they cause depletion of the ozone layer, leading to increased UV radiation exposure on Earth.

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