Hydrocarbons are classified into Cloze (1): JXUwMDJjJXUwMDFjJXUwMDFhJXUwMDE3JXUwMDAw classes depending on the type of bonds between  carbon atoms. in alkanes, every carbon atom is bonded to another carbon atom by a Cloze (2): JXUwMDJiJXUwMDFhJXUwMDA3JXUwMDA5JXUwMDBiJXUwMDA5 covalent bond. in alkanes, at least one carbon atom is bonded to another carbon atom by a Cloze (3): JXUwMDNjJXUwMDBiJXUwMDFhJXUwMDE3JXUwMDBlJXUwMDA5 covalent bond. in alkynes, at least one carbon atom is bonded to another by Cloze (4): JXUwMDJjJXUwMDA2JXUwMDFiJXUwMDE5JXUwMDFjJXUwMDA5 covalent bond.