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The term aliphatic is used to distinguish such molecules from those deemed aromatic because of an aromatic ring structure (e.g., the benzene ring)—in accordance with Hückel's "4n+2" rule for ring valence electrons—and to distinguish them from other "unsaturated" compounds which contain carbon-carbon chemical bonds of an order higher than 1 (i.e., those compounds containing alkene or alkyne functional groupIn ecology functional groups are collections of organisms based on morphological, physiological, behavioral, biochemical, or environmental responses or on trophic criteria. In organic chemistry functional groups are submolecular structural motifs, characts). The alkaneAn alkane in organic chemistry is a type of hydrocarbon in which the molecule has the maximum possible number of hydrogen atoms and so has no double bonds (they are saturated). The generic formula for acyclic alkanes, also known as aliphatic hydrocarbons series of hydrocarbonIn chemistry, a hydrocarbon is an organic compound consisting only of carbon and hydrogen. They all consist of carbon backbone and atoms of hydrogen attached to that backbone, also aliphatic hydrocarbons. For example, methane ( swamp gas) is a hydrocarbons are aliphatic compounds.