Comment on the nature of two S−O bonds formed in


Comment on the nature of two S−O bonds formed in SO2 molecule. Are the two S−O bonds in this molecule equal?


The electronic configuration of S is 1s2 2s2 2p6 3s2 3p4.

During the formation of SO2, one electron from 3p orbital goes to the 3d orbital and S undergoes sp2 hybridization. Two of these orbitals form sigma bonds with two oxygen atoms and the third contains a lone pair. p-orbital and d-orbital contain an unpaired electron each. One of these electrons forms pπpπ bond with one oxygen atom and the other forms pπdπ bond with the other oxygen. This is the reason SO2 has a bent structure. Also, it is a resonance hybrid of structures I and II.

Both S−O bonds are equal in length (143 pm) and have a multiple bond character.

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