Which of the following is a heterocyclic compound?

AToluene
BMethylcyclohexane
CCyclohexane
DTetrahydrofuran (oxolane)

Answer: D

A heterocyclic compound has at least one atom other than carbon in its ring. Cyclohexane, methylcyclohexane and toluene have only carbon atoms in the ring. Tetrahydrofuran has an oxygen atom in a five-membered ring, so it is heterocyclic.

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