Give the uses of freon 12, DDT, carbon tetrachloride and iodoform.

Explanation

### Step-by-Step Solution

1. **Freon 12 (Dichlorodifluoromethane, CF2Cl2)**:
- Freon 12 is commonly known as dichlorodifluoromethane.
- **Uses**: It is primarily used as a refrigerant in refrigerators and air conditioning systems due to its effective heat absorption properties.

2. **DDT (Dichlorodiphenyltrichloroethane)**:
- DDT is an insecticide known for its effectiveness in controlling pests.
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