Unsaturated Compound
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Unsaturated compound is a chemical term. It is used in Organic chemistry to describe a compound, particularly carbon chains, which has one or more double bonds. It is in this sense that unsaturated is used to describe dietary fats.
Ethane, a saturated compound, has the chemical formula H3C-CH3. Ethene, an unsaturated compound, has the formula H2C=CH2. Ethene is first member of the Alkene family, all of which have one or more double bonds between carbon atoms.
Closely related are the Alkynes which are even more unsaturated having triple bonds between carbon atoms.