| Term | Definition |
| single bond | a bond between two carbon atoms in which 2 electrons (or 1 pair of electrons) are shared |
| alkyne | unsaturated hydrocarbon in which at least one pair of carbon atoms is joined by a triple covalent bond |
| normal | a straight parent chain |
| double bond | a bond between two carbon atoms in which 4 electrons (or 2 pairs of electrons) are shared |
| substituent | any atom or goup of atoms that can take the place of a hydrogen atom on a parent hydrocarbon molecule |
| covalent bond | chemical bonding in which electrons are shared rather than transferred |
| alkene | unsaturated hydrocarbon in which at least one pair of carbon atoms is joined by a double covalent bond |
| branched chain | a parent chain with an additional hydrocarbon structure attached |
| isomers | organic compounds that have the same molecular formula but different structural formulas |
| alkane | saturated hydrocarbon in which all the bonds between carbon atoms are single covalent bonds |
| unsaturated hydrocarbon | one or more of the bonds between carbon atoms is a double covalent or triple covalent bond |
| hydrocarbon | organic compounds that only contain hydrogen and carbon |
| saturated hydrocarbon | straight-chain or branched chain in which all the bonds between carbon atoms are single covalent bonds. (example - alkene group) |
| organic chemistry | the study of carbon compounds |
| parent chain | the longest continuous chain of carbons in a molecule |
| benzene | cyclic hydrocarbon with alternating single/double bonds |
| cyclic hydrocarbon | hydrocarbons form a ring |