Which of the following is an alicyclic compound?

ANaphthalene
BCyclohexane
CPyridine
DBenzene

Answer: B

Alicyclic compounds contain a carbocyclic ring that is not aromatic. Benzene and naphthalene are aromatic, and pyridine is an aromatic heterocycle. Cyclohexane is a non-aromatic carbocycle, so it is alicyclic.

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