The correct order of bond length is:

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Question

(A) The bond length is inversely proportional to the bond order.$1$. For $CO$,the bond order is $3$.$2$. For $CO_2$ $(O=C=O)$,the bond order is $2$.$3

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$CO_3^{2-} > CO_2 > CO$

Vedclass · Answer

(A) The bond length is inversely proportional to the bond order.$1$. For $CO$,the bond order is $3$.$2$. For $CO_2$ $(O=C=O)$,the bond order is $2$.$3$. For $CO_3^{2-}$,the resonance hybrid results in a bond order of $1.33$.Since the bond order follows the order $CO > CO_2 > CO_3^{2-}$,the bond length follows the reverse order: $CO_3^{2-} > CO_2 > CO$.

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