Electronic Structure of Alkenes ■Carbon atoms in a p orbitals bond double bond are sp2- hybridized ■Three equivalent orbitals at120° separation in plane Fourth orbital is atomic orbitals T bond p orbital sp2carbon Carbon-carbon double bond Combination of electrons in two sp2 orbitals of two atoms forms o bond between them Additive interaction of p 90 rotatio orbitals creates aπ bonding orbital ■ Occupiedπorbital prevents rotation about o- bond Broken bond after rotation bond (p orbitals are parallel) (p orbitals are perpendicular) Electronic Structure of Alkenes „ Carbon atoms in a double bond are sp 2 - hybridized „ Three equivalent orbitals at 120º separation in plane „ Fourth orbital is atomic p orbital „ Combination of electrons in two sp 2 orbitals of two atoms forms σ bond between them „ Additive interaction of p orbitals creates a π bonding orbital „ Occupied π orbital prevents rotation about σ - bond