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Share. By Anne Marie Helmenstine, Ph.D. Definition: A pi bond is a covalent bond formed between two neighboring atom's unbonded p-orbitals. An unbound p-orbital electron in one atom forms an electron pair with a neighboring atom's unbound, parallel p-orbital electron.This electron pair forms the pi bond.hare. By Anne Marie Helmenstine, Ph.D. Definition: A pi bond is a covalent bond formed between two neighboring atom's unbonded p-orbitals. An unbound p-orbital electron in one atom forms an electron pair with a neighboring atom's unbound, parallel p-orbital electron.
1 Note that ethene has 4 hydrogens attached to the double bond. 2  A monosubstituted alkene has 3, a disubstituted alkene has 2, a trisubstituted alkene has 1, and a tetrasubstituted alkene as none. 3  Please note, also, that the nature of the alkyl group makes no difference. Hence the pi bond is weaker than the sigma bond, easier to break, making alkenes much more reactive than alkanes. 2  You should know that the pi bond strength is ca. 63 kcal/mol, and that the pi bond is completely broken by a relative rotation of 90 degrees.