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<center>
<font size="5">In organic chemistry, an alkene is an unsaturated
hydrocarbon that contains at least one carbon–carbon double bond.Alkene,
olefin, and olefine are used often interchangebly (see nomenclature
section below). Acyclic alkenes, with only one double bond and no other
functional groups, known as mono-enes, form a homologous series of
hydrocarbons with the general formula CnH2n.Alkenes have two hydrogen
atoms less than the corresponding alkane (with the same number of carbon
atoms). The simplest alkene, ethylene (C2H4), which has the
International Union of Pure and Applied Chemistry (IUPAC) name ethene is
the organic compound produced on the largest scale industrially.
Aromatic compounds are often drawn as cyclic alkenes, but their
structure and properties are different and they are not considered to be
alkenes.</font>
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