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In chemistry, vinyl or ethenyl is the functional group −ch=ch2, namely the ethene molecule (h2c=ch2) minus one hydrogen atom. the name is also used for any compound containing that group, namely r−ch=ch2 where r is any other group of atoms. an industrially important example is vinyl chloride, precursor to pvc, a plastic commonly known as vinyl. vinil is one of the alkenyl functional groups. on a carbon skeleton, sp-hybridized carbons or positions are often called vinylic.