Xylene and toluene are aromatic hydrocarbons.

• A. True
• B. False
• C. Aliphatic hydrocarbons
• D. Polar solvents

Answer: (A)

Xylene and toluene contain benzene rings, making them aromatic hydrocarbons. The benzene ring provides a stable, conjugated π-electron system that follows Huckel's rule (4n+2 π electrons), which is the hallmark of aromaticity. Toluene is methylbenzene and xylene is dimethylbenzene, both composed entirely of carbon and hydrogen, so they are hydrocarbons. They are nonpolar solvents, not polar solvents, and they are not aliphatic hydrocarbons since aliphatic refers to nonaromatic carbon chains or rings. Therefore, the statement is true.