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Q.

In which of the following ionization processes, the bond order has increased and the magnetic behaviour has changed?

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a

NONO+

b

C2C2+

c

O2O2+

d

N2N2+

answer is B.

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Detailed Solution

The order of increasing energy of molecular orbitals is 

(σ2s)σ2sπ2pxπ2pyσ2pzπ2pxπ2pyσ2pz

The valence electrons in C2,NO,O2 and N2 are 8, 11, 12 and 10, respectively. The given criteria is satisfied only by  NO. Its configuration is

(σ2s)2(σ2s)2π2px2π2py2σ2p22π2px1

In converting  NO to NO+, the electron is removed from antibonding molecular orbital and the resultant ion possesses no unpaired of electrons.

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