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Question

According to Molecular orbital theory which of the following is correct?

A
LUMO level for C2 molecule is σ2px orbital
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B
In C2 molecules, both the bonds are π bonds
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C
In C22 ion, there is one σ and two π bonds
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D
All the above are correct
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Solution

The correct option is A LUMO level for C2 molecule is σ2px orbital
C2 molecule has 12 electrons. Its molecular orbital diagram is:
(σ1s)2(σ1s)2(σ2s)2(σ2s)2(Π2px)2(σ2px)
(Π2p4)2
Here LUMO is the least unoccupied molecular orbital. For C2, LUMO is σ2px

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