What chemical was being transported in the pipeline in the scenario?

• A. Benzene
• B. Ethylbenzene
• C. Toluene
• D. Cyclohexane

Answer: (A)

In this kind of scenario, identify clues that match a chemical known for being a simple, volatile aromatic hydrocarbon that’s commonly transported in pipelines. Benzene fits that profile: it’s a colorless liquid with a distinct, sweet odor, highly volatile, and widely used in gasoline blends and industrial solvents. Its volatility means vapors can quickly form a flammable plume, and its toxic, carcinogenic nature makes safety considerations (evacuation radii, respiratory protection, exposure limits) a priority in a release situation.

Compared with the other options, those are either non-aromatic or have different properties (higher boiling points, lower volatility, different hazards), so the clues in the scenario align most closely with benzene.