Which substance is a white odorless bitter crystalline compound derived from morphine?

• A. Heroin
• B. Ethanol
• C. Alcohol
• D. Hemorrhage

Answer: (A)

Heroin is diacetylmorphine, a white, odorless, bitter crystalline compound formed by acetylating morphine. This modification makes it a stable, powdery substance that can cross into the brain more rapidly, which is why heroin is described in forensic and pharmacology sources as a white, odorless, bitter crystalline compound derived from morphine. The other options don’t fit this description: ethanol and alcohol are simple drinking spirits not derived from morphine, and hemorrhage refers to bleeding rather than a chemical substance.