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Question: The correct order of increasing C-O bond length of CO, CO32–, CO2 is :...

The correct order of increasing C-O bond length of CO, CO32–, CO2 is :

A

CO32–< CO2< CO

B

CO2< CO32–< CO

C

CO< CO32–< CO2

D

CO< CO2< CO32–

Answer

CO< CO2< CO32–

Explanation

Solution

Bond length ∝\propto 1Bondorder\frac{1}{Bondorder}

Bond order of CO = 3 (as isoelectronic with N2)

Bond order = No.ofbondsinallpossiblesidesNo.ofresonatingstructures\frac{No.ofbondsinallpossiblesides}{No.ofresonatingstructures}

Bond order of CO2 = 42\frac{4}{2} = 2

Bond order of CO32– =43\frac{4}{3} = 1.33

So, order of bond length of C – O is CO < CO2 < CO32–