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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)

Its not just a double bond in a organic compound .,. Its the c=c present in a organic compunds,,., hence alkenes are also known as Olefins