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# The species having bond order different from that in CO is

$\begin{array}{1 1}(a)\;NO^-&(b)\; NO^+\\(c)\;CN^-&(d)\;N_2\end{array}$

CO bond order is 3
$NO^-$ bond order is 2
$NO^+$ bond order is 3
$CN^-$ bond order is 3
$N_2$ bond order is 3
Among all these $NO^-$ bond order is different from CO bond order.
Hence (a) is the correct answer.