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Question -

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



Answer -

The electronic configuration of Sis 1s2 2s2 2p6 3s2 3p4.

During the formation of SO2, one electron from 3p orbitalgoes to the 3d orbital and S undergoes sp2 hybridization. Two of these orbitals formsigma bonds with two oxygen atoms and the third contains a lone pair. p-orbital and d-orbitalcontain an unpaired electron each. One of these electrons forms pπ- pπ bondwith one oxygen atom and the other forms pπ- dπ bond with the other oxygen. This is the reason SO2 has a bent structure. Also, it is aresonance hybrid of structures I and II.

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

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