Benzene (C6H6) contains a six-membered ring with three alternate double bonds. Compounds having this characteristic unit are called:

1. Benzene is a cyclic hydrocarbon with a six-membered ring. 2. Its ring carries three alternate double bonds. 3. Compounds containing this characteristic ring unit are called aromatic compounds. 4. Rule out A: double bonds make it unsaturated, so 'saturated' is wrong. 5. Rule out B: 'aliphatic' means open-chain, but benzene is a ring. 6. Rule out D: 'branched' describes a side chain, not benzene's closed ring. _Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 9 "Carbon Compounds", p.126_