According to M.O. theory for the atomic species " $C_{2}$ " which is not correct ?

Bond order is zero and it is paramagnetic.

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Bond order is zero and it is diamagnetic.

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Bond order is two and it is paramagnetic.

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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 $= \frac{1}{2} (n u m b e r o f b o n d i n g e l e c t r o n s - n u m b e r o f a n t i b o n d i n g e l e c t r o n s)$

Bond order of $C_{2}$ :

Bond order $= \frac{1}{2} (8 - 4)$ =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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