According to Molecular Orbital Theory, which of the following conversions involves both an increase in bond order and a change in magnetic nature from paramagnetic to diamagnetic?

Step-by-step solution

For NO NO ^- , the incoming electron enters the ^ * antibonding orbital. Bond order decreases from 2.5 to 2.0 . Both species are paramagnetic. For C ₂ C ₂^- , the incoming electron enters the _ 2p_z bonding orbital. Bond order increases from 2.0 to 2.5 . Magnetic nature changes from diamagnetic to paramagnetic. For O ₂^+ O ₂ , the incoming electron enters the ^ * antibonding orbital. Bond order decreases from 2.5 to 2.0 . Both species are paramagnetic. For CN CN ^- , CN has 13 electrons and its configuration is _ 1