A compound where the hydroxy group is bonded to a sp2-hybridised carbon-carbon double bond (C=C) is called vinylic alcohol. They contains vinyl group i.e.H−C=CH2​.A compound where the hydroxy group is bonded to a sp2-hybridised carbon-carbon double bond (C=C) is called vinylic alcohol. They contains vinyl group i.e.H−C=CH2​. Thus, but-2-en-2-ol