Class 12 Chemistry - Chapter The p-Block Elements NCERT Solutions | Comment on the nature of two S-O bonds f

Welcome to the NCERT Solutions for Class 12th Chemistry - Chapter The p-Block Elements. This page offers a step-by-step solution to the specific question from Exercise 1, Question 21: comment on the nature of two s o bonds formed in s....
Question 21

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

Answer

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 p π- p π bond with one oxygen atom and the other forms p π- d π 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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