Question

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

• A. $N{O}^{-}$
• B. $N{O}^{+}$
• C. $C{N}^{-}$
• D. $N_2$

Answer 1

Answer: (A)

$N{O}^{-}$

$CO$ contains $14$ electrons ( $6$ from carbon and $8$ from oxygen).

$N{O}^{-}$ contains $16$ electrons ( 7from nitrogen,8 from oxygen, add 1 more for negative charge).

$N{O}^{+}$ has $14$ electrons ( $7$ from nitrogen, $8$ from oxygen, subtract 1 for positive charge).

$C{N}^{-1}$ has $14$ electrons ( $7$ from nitrogen, $6$ from carbon, add $1$ more for negative charge).

$N_2$ has $14$ electrons ( $7$ from nitrogen each).

The species containing the same number of electrons have the same bond order.

So $N{O}^{-}$ is the only one which has bond order different. So option $A$ is correct.