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Bond Order by MOT

The C-O bon...

Question

The $C - O$ bond length in $C O$ , $C O_{2}$ , and $C O_{3}^{2 -}$ follows the order:

A

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

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B

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

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C

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

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D

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

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Solution

The correct option is B $C O < C O_{2} < C O_{3}^{2 -}$
In $C \equiv O$ there is is triple bond
In $O = C = O$ there is is double bond
In $C O_{3}^{2 -}$ , bond length is between one and two due to resonance in the structure.
Bond length is inversely proportional to bond order.

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