What structural features us identify a compound as an alkane, a cycloalkane, an alkene, an alkyne, a saturated hydrocarbon or an aromatic hydrocarbon? 1. contains at least one ring of three or more carbon atoms joined by single bonds. contains at least one double bond between carbon atoms. 3. is an acryclic hydrocarbon that contains only single bonds. contains one or more planar, six membered rings of carbon atoms with delocalized pi-bonding throughout the ring 5. contains only single bonds. contains at least one triple bond between carbon atoms.