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Question

Which of the following cannot exist on the basis of MO theory?


A

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B

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C

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D

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Solution

The correct option is C


To find out about the existence of a molecule, we have to check the bond order. If the bond order is 0 or negative, then the molecule does not exist.

So, to check the bond order,

Let's draw their MO diagrams.

Now,

For H2+ We have 1 less electron in energy level diagram

For He2+ We have 1 less electron in energy level diagram (Because of the + sign, i.e., it means one less electron)

Now,

Bond Order = 12 [Bonding electrons - Anti Bonding electrons]

(BE) - (ABE)

For H2+

Bond order = 12 [1 - 0] = 1/2 [Possible]

For He2+

Bond order = 12 [2 - 1] = 1/2 [Possible]

For He2

Bond order = 12 [2 - 2] = 0 [Not possible]

For O2

Bond order =12 [10 - 6] = 2 [Possible]

So, only He2 has bond order 0, therefore not possible.


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