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Q.
The correct order of increasing $C — O$ bond lengths in $CO, CO_{3}^{2-}$ and $CO_{2}$ is:
The p-Block Elements
Solution:
Structures of $CO_{2}, CO$ and $CO^{2-}_{3}$ are
Bond multiplicity decreases the bond length. Thus, CO with a triple bond will have shortest C — O bond length. $CO_{2}$ with a double bond will have a larger C — O bond length. CO|" is a resonance hybrid of three structures with a C — 0 length of more than a C — O double but less than a C — O single bond. Thus, C — O bond length is maximum in $CO^{2-}_{2}$.
