Tetraethyl lead is a

Options

A. Solvent
B. Petroleum additive
C. Oxidising agent
D. Fire extinguisher

Answer

To determine the correct classification of tetraethyl lead, let's analyze the options provided: solvent, petroleum additive, oxidizing agent, or fire extinguisher.

### Step-by-Step Solution:

1. **Understanding Tetraethyl Lead**:
- Tetraethyl lead is a chemical compound with the formula \( \text{C}_8\text{H}_{20}\text{Pb} \).
- Its IUPAC name is tetraethyl plumbane.

2. **Chemical Structure**:
- The structure consists of a lead (Pb) atom bonded to four ethyl groups (C2H5).
- This gives it a tetrahedral geometry.

3. **Properties of Tetraethyl Lead**:
- It is known to be water-insoluble.
- It has been used historically in various applications, particularly in fuels.

4. **Common Uses**:
- Tetraethyl lead is primarily used as an anti-knock agent in gasoline.
- It helps to improve the octane rating of fuels, which reduces engine knocking and improves performance.

5. **Evaluating the Options**:
- **Solvent**: Tetraethyl lead is not commonly used as a solvent.
- **Petroleum Additive**: It is indeed used as an additive in gasoline and jet fuels to enhance performance.
- **Oxidizing Agent**: Tetraethyl lead does not function as an oxidizing agent.
- **Fire Extinguisher**: It is not used as a fire extinguisher.

6. **Conclusion**:
- Based on its properties and uses, the correct classification for tetraethyl lead is that it is a **petroleum additive**.

### Final Answer:
Tetraethyl lead is a petroleum additive.