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Question

According to M.O. theory for the atomic species "C2" which is not correct ?

A
Bond order is zero and it is paramagnetic.
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B
Bond order is zero and it is diamagnetic.
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C
Bond order is two and it is paramagnetic.
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D
Bond order is two and it is diamagnetic.
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Solution

The correct options are
A Bond order is zero and it is paramagnetic.
B Bond order is zero and it is diamagnetic.
C Bond order is two and it is paramagnetic.
Bond order =12(numberofbondingelectronsnumberofantibondingelectrons)

Bond order of C2:

Bond order =12(84)=2

As it has only paired electrons and no unpaired electrons it is diamagnetic
So options A, B & C are incorrect statements and option D is a orrect statement.
Hence options A,B & C are correct.

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