The electrons placed in antibonding molecular orbital destabilise the molecule. This is because

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in antibonding molecular orbital, the mutual repulsion of the electrons is more than the attraction between the electrons and the nuclei

in antibonding molecular orbital, the repulsion between the nuclei is high due to presence of a nodal plane between the nuclei

Both (a) and (b)

None of the above

answer is A.

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Detailed Solution

The electrons placed in the antibonding molecular orbital destabilize the molecule. This is because the mutual repulsion of the electrons in this orbital is more than the attraction between the electrons and the nuclei, which causes a net increase in energy.

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