The value of bond order of $C - O$ bond for $C O_{3}^{2 -}$ ion is:

1.25

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1.33

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1.5

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1.0

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Solution

The correct option is B $1.33$
We can see in the given figure that the compound undergoes resonance, with bond order $1.33$ .

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The correct order of increasing C-O bond lengths in CO, $C O_{3}^{2 -}$ and $C O_{2}$ is:

C - O

C O, C O_{3}^{2 -}, C O_{2}

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