Question

Which of the following statements is/are correct?

• A. The bond length in CO is 1.128 Å and CO⁺ is 1.115 Å because during conversion of CO to CO⁺ electron is removed from anti bonding orbital
• B. The bond length in CO is 1.115 Å and CO⁺ is 1.128 Å because during conversion of CO to CO⁺ electron is removed from bonding orbital.
• C. During conversion of CO to CO⁺ bond length does not vary because bond order remain same.
• D. The bond length in CO is 1.115 Å and CO⁺ is 1.128 Å because bond order decreases during conversion of CO to CO⁺

Answer 1

Answer: (A)

The bond length in CO is 1.128 Å and CO⁺ is 1.115 Å because during conversion of CO to CO⁺ electron is removed from anti bonding orbital

Answer 2

Because of the greater difference in electronegativity between C and O, the energy of the MOs in CO are in the following order

$\sigma_{1s}^{2}$ $\pi_{2p_{y}}^{2}$ $\sigma_{2p_{x}}^{2}$ $\sigma_{2s}^{*^{2}}$

BO in CO = $\frac{1}{2}$ (10 – 4) = 3

When CO is converted to CO⁺ , one electron is removed from antibonding MOs , hence , the BO in CO⁺ is greater than CO.