Which category includes substances found in gasoline, paints, solvents, sunscreen, and more?

• A. Acids
• B. Alkalis
• C. Petroleum-based
• D. Hydrocarbons

Answer: (D)

Substances like gasoline, paints, solvents, and many sunscreen ingredients are largely hydrocarbons—organic molecules built from carbon and hydrogen. Gasoline is a complex mix of hydrocarbon molecules; paints and solvents rely on hydrocarbon liquids to dissolve pigments and help spread or evaporate; sunscreen often uses hydrocarbon-based carriers or emollients. Because these products are defined by their chemical makeup as carbon-and-hydrogen compounds, categorizing them as hydrocarbons best captures what they have in common. Acids and alkalis describe pH-based properties, which aren’t the primary way these items are grouped, and petroleum-based is about origin rather than the specific chemical nature; hydrocarbons directly describe the component type that ties these substances together.