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25) a) What are sigma and Pi bond?b) Why sigma bond stronger than a Pi bond.lingar cnmhination of atomic orlb

Answer»

a)Sigma And Pi Bonds. Asigma bondis a covalentbondwhich is formed by the head on overlap of two atomic orbitals. The combination of overlapping orbitals can be s-s, s-pzor pz-pz. ... But there can be a maximum of twopi bondsbetween two atoms in a molecule.

b)Pi bonds areusually weakerthan sigma bonds. Quantum mechanics says this is because the orbital paths are parallel so there is much less overlap between the p-orbitals.Pi bondshappen when two atomic orbitals are in contact through two areas of overlap.

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