**Chloro Compound as Fire Extinguisher:**

**Introduction:**
Fire extinguishers are devices used to control or extinguish small fires. They work by removing one or more of the three elements required for a fire to burn: heat, oxygen, and fuel. Different types of fire extinguishers are designed to combat specific types of fires based on the nature of the fuel involved.

**Chloro Compounds:**
Chloro compounds are organic compounds that contain chlorine atoms. These compounds can be classified into various categories based on the number of chlorine atoms present and their arrangement within the molecule. Some common chloro compounds include CH3Cl (methyl chloride), COCl2 (phosgene), CCl4 (carbon tetrachloride), and CHCl3 (chloroform).

**Fire Extinguishing Properties:**
When it comes to choosing a chloro compound as a fire extinguisher, it is important to consider its fire extinguishing properties. The ideal compound should have the ability to remove heat and/or oxygen from the fire, thereby extinguishing it.

**Explanation:**
Among the given options, the chloro compound that can be used as a fire extinguisher is CCl4 (carbon tetrachloride).

**Carbon tetrachloride (CCl4):**
- Carbon tetrachloride is a colorless liquid that was widely used as a fire extinguisher in the past.
- It has a high heat capacity, which means it can absorb a significant amount of heat from the fire, thereby reducing its temperature.
- CCl4 can also act as an oxygen inhibitor, preventing the fire from accessing oxygen and causing it to extinguish.
- Additionally, carbon tetrachloride is non-conductive, which makes it suitable for extinguishing electrical fires.

**Other Options:**
- CH3Cl (methyl chloride) is a flammable gas and should not be used as a fire extinguisher.
- COCl2 (phosgene) is a toxic gas and is not suitable for firefighting.
- CHCl3 (chloroform) is a volatile liquid and may not be effective in extinguishing fires.

**Conclusion:**
In conclusion, the chloro compound that can be used as a fire extinguisher is CCl4 (carbon tetrachloride). It has the ability to absorb heat, inhibit oxygen, and is non-conductive, making it an effective choice for extinguishing fires. However, it is important to note that carbon tetrachloride is no longer commonly used as a fire extinguisher due to its high toxicity and potential environmental hazards.