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Each carbon has a single hydrogen atom attached to it. The lines in this figure represent the Ï bonds in benzene. The basic ring structure is composed of Ï bonds formed from overlap of sp2 hybrid orbitals on adjacent carbon atoms. The unhybridized carbon pz orbitals project above and below the plane of the ring.
Two of the four sp3 hybrid orbitals are used to form bonds to the two hydrogen atoms, and the other two sp3 hybrid orbitals hold the two lone pairs on oxygen. The two OâH bonds are formed from overlap of the sp3 hybrid orbitals from oxygen with the 1s atomic orbitals from the hydrogen atoms. Each OâH covalent bond is called a sigma (Ï) bond since the shared electron pair in each bond is centered in an area on a line running between the two atoms. 14. H2CO has 2(1) + 4 + 6 = 12 valence electrons.