The bond Length decreases with increase of bond order which is the multiplicity of bond. If BO is 1 its a single bond; 2 for double bond and 3 for triple bond. 
The bond length of O−O in H2O2 is 147.5pm, in O3 is 128pm and in O2 it is 121pm.
The correct order in which the O−O bond length increases in the following is:
Held on 30 Apr 2005 · Verified 9 Jul 2026.
O2<H2O2<O3
O3<H2O2<O2
H2O2<O2<O2
O2<O3<H2O2
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