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Question

(A) $CO$ contains $14$ electrons ($6$ from $C$ and $8$ from $O$).Bond order of $CO$ is $3$.$NO^{-}$ contains $16$ electrons ($7$ from $N$,$8$ from $O$

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$NO^{-}$

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(A) $CO$ contains $14$ electrons ($6$ from $C$ and $8$ from $O$).Bond order of $CO$ is $3$.$NO^{-}$ contains $16$ electrons ($7$ from $N$,$8$ from $O$,plus $1$ for negative charge). Bond order is $2$.$NO^{+}$ contains $14$ electrons ($7$ from $N$,$8$ from $O$,minus $1$ for positive charge). Bond order is $3$.$CN^{-}$ contains $14$ electrons ($6$ from $C$,$7$ from $N$,plus $1$ for negative charge). Bond order is $3$.$N_2$ contains $14$ electrons ($7$ from each $N$). Bond order is $3$.Since $NO^{-}$ has $16$ electrons,its bond order is different from $CO$. Thus,option $A$ is correct.

The species having a bond order different from that in $CO$ is

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