A conjugated hydrocarbon whose pi-site graph is bipartite: its sites can be divided into two sets with every retained resonance interaction joining opposite sets. The definition refers to the selected nearest-neighbour Hückel model, not simply to a visually alternating Lewis drawing.
Articles by others on the same topic
An alternant hydrocarbon is a type of polycyclic aromatic hydrocarbon (PAH) that exhibits a specific structural property: it contains alternating single and double bonds in its carbon framework, typically in a planar arrangement. These hydrocarbons have a regular alternation of carbon-carbon bonds, meaning that no two adjacent bonds are of the same type (single or double).