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In organic chemistry sigma bonds (Ï) are always the first bond between two atoms, resulting from overlap along the bonding axis (of hybrid orbitals), while pi bonds (Ï) are second and third bonds resulting from the overlap of p orbitals, above and below (or in front and back of) the bonding axis.
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.