A six-carbon unsaturated hydrocarbon with one or more double bonds between carbon atoms.
From 'hexo-' (six carbons) and '-ylene' (unsaturated hydrocarbon suffix). The term combines systematic nomenclature developed in 19th-century organic chemistry.
Those double bonds in hexoylene make it more reactive and useful than plain hexane—it's like the difference between a locked door and an unlocked one; the double bonds are the 'handles' that let other molecules grab on.
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