Propyl gallate is used as the following .

Options

A. Sweetening agent
B. Preservative
C. Detergent
D. Antimalarial

Answer

### Step-by-Step Solution:

1. **Understanding Propyl Gallate**:
- Propyl gallate is a chemical compound derived from gallic acid and is commonly used in various industries.

2. **Identifying the Uses**:
- The question asks for the uses of Propyl Gallate. It is important to analyze the options provided: sweetening agent, preservative, detergent, and anti-malarial.

3. **Analyzing Each Option**:
- **Sweetening Agent**: Propyl gallate is not known for its sweetening properties.
- **Preservative**: Propyl gallate is widely recognized as a preservative. It helps prevent the oxidation of fats and oils, thereby extending the shelf life of food products.
- **Detergent**: Propyl gallate does not function as a detergent.
- **Anti-malarial**: There is no evidence supporting the use of Propyl gallate as an anti-malarial agent.

4. **Conclusion**:
- Based on the analysis, the correct use of Propyl Gallate is as a **preservative**. It is primarily used in food products, cosmetics, and other applications to protect against oxidation.

### Final Answer:
- Propyl Gallate is used as a **preservative**.