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hydrocarbons containing one or more multiple carbon-carbon bonds. Among the unsaturated hydrocarbons are olefins, or alkenes, of the general formula C nH 2n (for example, ethylene, CH 2 ═ CH 2, and propylene, CH 3CH ═ CH 2), and also hydrocarbons of the general formula C nH 2n - 2; (1) unsaturated hydrocarbons containing a triple bond, called alkynes (acetylene, CH≡CH, and its homologues ...

groups of related (having the same chemical functions and the same type of structure) organic compounds that differ from one another only by one or more methylene (CH 2) groups. (The CH 2 group is called the homologous difference.)Homologous series are known for saturated hydrocarbons (alkanes) of the general formula C nH 2n+2 (methane CH 4, ethane C 2H 6, propane C 3H 8, and so on), unsaturated ...

... n.) Olefiant gas or ethylene; hence, by extension, any one of the series of unsaturated hydrocarbons of which ethylene is a type. See Ethylene.

... a.) Of, pertaining to or derived from, fat; fatty; -- applied to compounds having an openc-hain structure. The aliphatic compounds thus include not only the fatty acids and other derivatives of the paraffin hydrocarbons, but also unsaturated compounds, as the ethylene and acetylene series.

any of a class of organic compounds consisting only of carbon and hydrogen atoms. Depending on their structure, a distinction is made between acyclic, or aliphatic, hydrocarbons, in which the carbon atoms are bound to one another in linear or branched chains, and isocyclic, or carbocyclic, hydrocarbons, the molecules of which form rings consisting of three or more carbon atoms. Isocyclic ...