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Question

The number of bonding electron pairs in N2 on the basis of molecular orbital theory is:

A
3
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B
2
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C
5
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D
4
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Solution

The correct option is C 5
There are 14 electrons in nitrogen. The molecular orbital configuration of molecule will be:
(σ1s)2,(σ1s)2,(σ2s)2,(σ2s)2,[(π2px)2=(π2py)2],(σ2px)2,[(π2px)0=(π2py)0],(σ2pz)0
Thus there are 5 bonding electron pairs and 2 non-bonding electron pairs

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