More is the single bond character more will be the bond length. 
Thus, correct order is CO<CO2<CO3−− Related Theory Compounds with formal C≡O triple bonds do not exist except for carbon monoxide, which has a very short, and strong bond (112.8 pm).
NEET UG 2007 — Chemistry Inorganic Chemistry
The correct C−O bond length among CO,CO3−2,CO2 is:
Held on 30 Apr 2007 · Verified 9 Jul 2026.
CO<CO32−<CO2
CO32−<CO2<CO
CO<CO2<CO32−
CO2<CO32−<CO
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