Which statement correctly describes sources of petroleum products?

• A. They are composed only of aliphatic hydrocarbons
• B. Refined petroleum products include both aliphatic hydrocarbons and aromatics such as benzene, toluene, and xylene used in paints, resins, plastics, glues, lacquers
• C. They contain only methane
• D. They are not used as solvents

Answer: (B)

Petroleum products come from refining crude oil and contain a mix of hydrocarbon types, not just one kind. They include both aliphatic hydrocarbons (the straight- and branched-chain compounds) and aromatic hydrocarbons (ring-structured molecules). In refined products you’ll find aromatic compounds such as benzene, toluene, and xylene, which are widely used as solvents in paints, resins, plastics, glues, and lacquers. This combination—aliphatics plus aromatics—explains why the statement describing both groups and naming common solvent use is the most accurate.

Saying they are composed only of aliphatic hydrocarbons isn’t correct because aromatics are also present. Saying they contain only methane is inaccurate since petroleum products comprise a broad spectrum of hydrocarbons beyond methane. Saying they are not used as solvents is false because many refined petroleum components serve as solvents in various industrial applications.