Exercise on Resonance Lewis Structures: Solutions

Question: SO3 has three resonance Lewis structures.
Draw these structures and compare the S−O bond length in SO3 to a normal S−O single and S=O double bond lengths.

Solution:
so3-reasoance

Because of resonance, the S−O bond in SO3 is neither single nor double bond.
It is shorter than S−O single bond, but longer than S=O double bond.





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