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Question

In O2, O2 and O22 molecular species, the total number of anti-bonding electrons respectively are:


A

7, 6, 8

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B

1, 0, 2

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C

6, 6, 6

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D

8, 6, 8

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Solution

The correct option is A

7, 6, 8


To know the number of anti-bonding electrons, lets draw the MO energy level diagrams of O2, O2 and O22


The following is the MOT diagram for Dioxygen O2 molecule:
As you can see, we have omitted the 1s orbitals for convenience. The 1s portion will be similar to the MOT diagram for O2 ion show above.



Now let us take a look at the MOT diagram for the peroxide ion O22


Now, we know that

Bonding electrons are represented by σ and π.

Anti-bonding electrons are represented by σ* and π*.

Therefore, from the above diagrams, we can see that,

Number of anti-bonding electrons in:

O2 7

O2 6

O22 8


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