The compound that is used as an anesthetic is?

Analysis

The question asks for the chemical compound among the given options that is historically and chemically recognized for its use as an anesthetic.

Concept Explanation

The compounds listed are all haloalkanes (specifically chloromethanes).

• CCl₄ (Tetrachloromethane): Primarily used as a solvent and in fire extinguishers. It is toxic to the liver.
• CHCl₃ (Trichloromethane): Commonly known as chloroform. In the 19th and early 20th centuries, it was widely used as an inhalational anesthetic during surgery. Although it has been largely replaced by safer alternatives (like halothane) due to its toxicity, it remains the classic answer in chemistry examinations regarding anesthetics.
• CH₂Cl₂ (Dichloromethane): Used primarily as a paint stripper and solvent.
• CH₃Cl (Chloromethane): Used as a refrigerant and in the production of silicones.

Step-by-Step Solution

1. Identify the chemical names: • A: Tetrachloromethane • B: Trichloromethane (Chloroform) • C: Dichloromethane • D: Chloromethane
2. Evaluate the medical history: Among these, Trichloromethane (CHCl₃) is the only one historically documented and widely taught in the Nigerian secondary school chemistry curriculum as an anesthetic agent. 3.

Conclusion

The correct compound is Trichloromethane, which is represented by the formula CHCl₃.

Exam Tip

When you see questions about haloalkanes, remember their common names:

• CHCl₃ = Chloroform (Anesthetic)
• CCl₄ = Carbon tetrachloride (Solvent/Fire extinguisher)
• CHI₃ = Triiodomethane (Iodoform - Antiseptic)