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Olefin, also called alkene, compound made up of hydrogen and carbon that contains one or more pairs of carbon atoms linked by a double bond. Olefins are examples of unsaturated hydrocarbons (compounds that contain only hydrogen and carbon and at least one double or triple bond).
alkyl group (ÄlËkÄ­l) [ key ], in chemistry, group of carbon and hydrogen atoms derived from an alkane molecule by removing one hydrogen atom (see radical). The name of the alkyl group is derived from the name of its alkane by replacing the-ane suffix with-yl, e.g., methyl, CH.The Columbia Electronic Encyclopedia, 6th ed. Copyright Â© 2012, Columbia University Press. All rights reserved.he name of the alkyl group is derived from the name of its alkane by replacing the-ane suffix with-yl, e.g., methyl, CH. The Columbia Electronic Encyclopedia, 6th ed. Copyright Â© 2012, Columbia University Press.