Which of these is NOT a List 2 chemical?

The correct answer identifies pseudoephendrine as not being a List 2 chemical. List 2 chemicals are identified as substances that may be precursors to controlled substances or have potential for abuse; they often include chemicals that are commonly found in illicit drug manufacture.

Pseudoephendrine is an over-the-counter medication primarily used as a decongestant. It is classified as a List 1 chemical under the Controlled Substances Act because it can be used in the illicit synthesis of methamphetamine, whereas List 2 chemicals do not usually include substances commonly used in medical treatments and have lower abuse potential.

In contrast, ethyl ether, potassium permangate, and acetone are listed chemicals in the context of chemical precursors used in illegal drug manufacturing. Ethyl ether is known for its use in the extraction and isolation of substances, potassium permangate can be used in oxidation reactions in illicit drug preparation, and acetone is commonly used in the synthesis of drugs as well. These distinctions clearly categorize pseudoephendrine differently within regulatory frameworks.