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In $N_{B}$ is the number of bonding electrons and $N_{A}$ is the number of antibonding electrons of a molecular species. Then choose the incorrect statement(s) for the given relationship.
$N_{B} > N_{A}$

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Molecular species may be stable or unstable

Molecular species does not exist

Molecular species is only paramagnetic species

Molecular species may have any integral, fractional or zero value of bond order

answer is B, C, D.

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Detailed Solution

Since, $N_{B} > N_{A}$

$B.O. = \frac{N_{B} - N_{A}}{2} > 0$

This zero bond order is the reason that the species does not exist. Even if this will be exist, it would be paramagnetic in nature.

Thus, B, C and D options are correct.

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