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It's impossible to have more than one sigma bond (with one sigma bond, any more bonds would have to be pi bonds). This is because sigma bonds are when orbitals are overlapping head-to-head, and it's impossible to have 2+ lobes pointing at each other and overlapping each other's orbitals in the head-to-head formation. Even if they were to be possible, the molecule would be extremely unstable.
In a double bond, one will always be a sigma bond and one will always be a pi bond. In a triple bond, one will always be a sigma bond and two will be pi bonds. This is because, in order to form sigma bonds, the orbitals need to align end to end. Afterward, the lobes can only align in a parallel form which are pi bonds.
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