Are My Bond Length Arrangements Correct?

[chaoseverlasting]

Homework Statement

Arrange in increasing order of bond length: CO, CO2, CO3^2-

The Attempt at a Solution

CO2 has double bonds, CO has back bonds and Co3 2- has a partial double bond (resonance), so it should be CO2>Co3 2->CO. Is that right?

 

[chaoseverlasting]

SOmebody?

 

[dextercioby]

I;d say that CO has resonance structures as well. So you claim that

CO_2 < CO_{3}^{2-} < CO ?

 

[chaoseverlasting]

Yeah. When I draw the MO diagrams of the three molecules to find the bond order, the answer is exactly the reverse though.