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4.Chemical Bonding and Molecular Structure
hard
The species having bond order different from that in $\mathrm{CO}$ is
A
$\mathrm{NO}^{-}$
B
$\mathrm{NO}^{+}$
C
$\mathrm{CN}^{-}$
D
$\mathrm{N}_2$
(IIT-2007)
Solution
$\mathrm{NO}^{-}$($16$ electron system)
Bond order $=2$.
$\mathrm{NO}^{\oplus}, \mathrm{CN}^{-}$and $\mathrm{N}_2$ are isoelectronic with $\mathrm{CO}$ therefore all have same bond order $(=3)$
Hence ($A$) is correct.
Standard 11
Chemistry
