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Question:

Correct order of increasing C−O bond length of CO, CO₂⁻, CO₂ is:

CO₂<CO₂⁻<CO

CO<CO₂<CO₂⁻

CO₂⁻<CO₂<CO

CO<CO₂⁻<CO₂

Solution:

Bond length α 1/Bond order
Bond orders of the given compounds are:
CO = 3, CO₂ = 2.3, CO₃²⁻ = 1.33
So the correct order of Bond lengths
CO < CO₂ < CO₃²⁻
Hence, option D is correct.