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Question

According to molecular orbital theory, the total number of bonding electron pairs in O2 is:

A
2
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B
3
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C
5
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D
4
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Solution

The correct option is C 5
Electronic configuration of O2 is determined as follows;
O2: (σ1s)2(σ1s)2(σ2s)2(σ2s)2(σ2p)2(π2p)4(π2p)2
Bond order =12(106)=2; double bond O=O.
The total number of bonding electron pairs is 5 as there are 10 electrons.

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