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I know that when you have a multiple bond like a double or a triple bond, only the first one is a sigma, and all the others are pi bonds. E.g. a triple bond contains one sigma and two pi bonds. But I'm not sure why that is the case structurally.
The first bond between is always a sigma bond, every additonal bondage (i.e. double, triple bond ) is a pi bond. Therefore a single bond is a sigma bond, but a double bond has one sigma bond and one pi bond, and a triple bond has one sigma bond and 2 pi bonds.
Sigma bonds are always single bonds, or the first bonds in a double or triple bond. The remaining bonds of a double or triple bonds are pi bonds. This is easy to visualize when looking at hybridized orbitals. The hybridized sp orbitals form sigma bonds while the unhybridized p orbitals form pi bonds
marg44 wrote:For these sigma and pi bonds, is one bond stronger than the other? Or are they of equal strength?
i think a sigma bond alone is stronger than a pi bond would be alone, but a pi bond is never alone, it's always on top of a sigma bond
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