Question

why are the bonds between S and O much shorter than expected for a single bond in its oxides​

Answer 1

Answer:

the bonds between sulphur and oxygen in oxides of sulphur (SO2 and SO3) are much shorter than might be expected for a single bond.

Explanation:

In these molecules, in addition to the normal π bond, a π bond is also formed by the sidewise overlap of a filled 2p orbital of oxygen with a vacant 3d orbital on the sulphur). This is called pπ - dπ bond and results in bringing the two atoms closer and thus accounts for the shorter bond length of the S−O bond.

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