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A sigma bond is the end-to-end overlap of the bonding orbitals, usually hybrid orbitals. The sigma bond is a single bond. A pi bond is the side-to-side overlap of unhybridized p-orbitals. A pi bond, along with a sigma bond form a double bond. sigma bond is used in hybridization but pi bond when dealing with saturated molecules is not used,that is double bonds.The oygen molecule is sp hybridized have you ever reasoned or found out why.
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):