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  4. The correct arrangement of the species in the decreasing order of the bond length between carbon and oxygen in them is

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Q. The correct arrangement of the species in the decreasing order of the bond length between carbon and oxygen in them is

KCETKCET 2014Chemical Bonding and Molecular Structure

Solution:

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partial double bond where $\pi$ electron is distributed along two $C - O$ bond.

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partial double bond where two $\pi$ electrons are distributed along three $C - O$ bond. Since, single bond, double bond and triple bonds have longest, intermediate and shortest bond lengths respectively, therefore order of bond lengths between $C$ and $O$ is

$CO _{3}^{-} > HCO _{2}^{-} > CO _{2} > CO$