Which of the following statement regarding nitric oxide is not correct ?

Question

$\begin{array}{1 1} \text{Nitric oxide dimerizes under ordinary condition} \\ \text{The bond order of nitrosoniumion is 3} \\ \text{There is a decrease in nitrogen oxygen bond length in going from No to } No^{+} \\ \text{In nitrosyis, nitric oxide is attached to the metal through nitrogen atom } \end{array}$