Question

O-O bond length in ozone molecule is 128 pm which is between o-o single bond length 148pm and o=o double bond length 121pm why?

Answer 1

Explanation:

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Answer 2

The O-O bond length in ozone is between the O-O single bond length and the O-O double bond length due to the presence of resonance in ozone molecules.

• Resonance is the cdelocaliztion of the pi-elecron cloud among the atoms that lie in  the same plane.
• Ozone molecules can exist in two possible resonating structures due to which the effective bond order between two oxygen atoms becomes equal to 1.5.
• This is why the O-O bond length in ozone molecules is intermediate between the O-O single bond and the O-O double bond.