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Question

The bond order and magnetic characteristics of CN are:

A
3, paramagnetic
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B
2.5, diamagnetic
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C
3, diamagnetic
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D
2.5, paramagnetic
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Solution

The correct option is C 3, diamagnetic
CN is a 14 electron system. The bond order and magnetism can be predicted using MOT.

The MOT electronic configuration of CN is:

(σ1s)2(σ1s)2(σ2s)2(σ2s)2(π2px)2(π2py)2(σ2pz)2

Bond order =12×(NbondingNanti bonding)=3

As CN does not have any unpaired electrons, and hence it is diamagnetic.

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