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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.
Answers. Best Answer: First you need to remember the definition of a pi bond, it is requires a double bond. H-O-H can only form single bonds because of the H. H-C-N has carbon with wants 4 bonds, so the C-N will be a triple bond, thus have 1 sigma bond and two pi bonds.O-C-OO]2- will be drawn as having one double bond (between the C and any one of the O's) and two single bonds, meaning that a pi bond will form between all 4 constituents. My vote would be for CO3 ^2- as the delocalized pi bond. Source(s):