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Why is O-O bond length in ozone (128 pm)...

Why is O-O bond length in ozone (128 pm) more than in `O_2` (122 pm)?

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The bond length in ozone molecule is intermediate between that of a O-O single bond (148 pm) and that of a O=O double bond (122 pm) due to resonance in `O_3` molecule which is a resonance hybrid of the following structures :
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