Alkenes structure Molecule is planar around the double bond. The carbon atoms of the C=C bond are sp hybridized and Double bond is made up of one o bond and one元bond. a-bond sp2 center 1209 120的 RRc=c心RR 120 Planar -bond Fig.1.Structure of an alkene functional group Alkenes structure Molecule is planar around the double bond.  The carbon atoms of the C=C bond are sp hybridized and Double bond is made up of one  bond and one  bond