Which of the following is a List 1 chemical?

• A. Sodium chloride
• B. Acetone
• C. Ephedrine
• D. Ethyl ether

Answer: (C)

List I chemicals are regulated precursors with a high potential for illegal drug production. Their sale is tightly controlled, requiring DEA registration, restricted distribution, and meticulous recordkeeping to prevent diversion. Ephedrine fits this category because it can be readily converted into methamphetamine, so its availability is tightly monitored. Sodium chloride is just a common salt used widely in foods, IV fluids, and labeling—nothing about it marks it as a drug precursor. Acetone and ethyl ether are basic solvents used in many legitimate processes; they don’t carry the same precursor designation as List I chemicals. For that reason, ephedrine is the List I chemical.