Question

The species having bond order different from CO is:

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

Answer 1

Answer: (A)

$N{O}^{-}$

Species having the same number of electrons have the same bond order.

Number of electrons in CO are 14(8 from oxygen and 6 from carbon).

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

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

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

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