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Sigma bonds refer to the s-orbital, and occur when two orbitals are overlapping end to end. Sigma bonds have no nodal planes containing the internuclear axis. This is the reason why a single bond contains one sigma bond. A pi bond refers to a p-orbital, and occurs when two orbitals overlap side to side. Pi bonds have a single nodal plane and contain the internuclear axis.
A sigma bond almost always forms first so automatically a multiple bond will have one sigma bond. Since pi bonds overlap side by side that is why they form on multiple bonds. Therefore any multiple bond will have one sigma bond and then either 1 or 2 pi bonds.
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