Pyrene is trade name of _______ when used as fire extinguisher

Options

A. `CO_(2)`
B. `CHCI_(3)`
C. `"CCI"_(4)`
D. `CH_(2)CI_(2)`

Answer

To solve the question "Pyrene is trade name of _______ when used as fire extinguisher," we need to identify the correct chemical compound associated with the trade name Pyrene that is used in fire extinguishers.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the trade name "Pyrene" and what chemical it corresponds to when used as a fire extinguisher.

2. **Analyzing the Options**: The options given are:
- CO2 (Carbon Dioxide)
- CHCl3 (Chloroform)
- CCl4 (Carbon Tetrachloride)
- CH2Cl2 (Dichloromethane)

3. **Identifying Fire Extinguishing Agents**: We need to recall which of these compounds is commonly used in fire extinguishers.
- CO2 is used in fire extinguishers but is not associated with the trade name Pyrene.
- CHCl3 (Chloroform) is not typically used as a fire extinguisher.
- CCl4 (Carbon Tetrachloride) is known to be used in fire extinguishers, particularly for small fires.
- CH2Cl2 (Dichloromethane) is also not commonly used as a fire extinguisher.

4. **Confirming the Correct Answer**: Among the options, CCl4 (Carbon Tetrachloride) is recognized as the chemical that corresponds to the trade name Pyrene when used as a fire extinguisher. It is a heavy, non-combustible liquid that can effectively extinguish small fires.

5. **Final Answer**: Therefore, the answer to the question is CCl4.

### Conclusion:
The trade name Pyrene corresponds to CCl4 (Carbon Tetrachloride) when used as a fire extinguisher.