This complex will have three linkage isomers as follows
\(\left[ Pt ( en )\left( NO _{2}\right) 2\right] I\)
\(\left[ Pt ( en )\left( NO _{2}\right)( ONO )\right] II\)
\(\left[ Pt ( en )( ONO )_{2}\right] III\)
$(I)\, [Ma_3b_2c]^{n \pm}\,\,\, (II)\, [M(AB)_3]^{n \pm}\,\,\, (III)\, [Ma_2b_2c_2]^{n \pm}$
$(I)\,\,\,-\,\,\,(II)\,\,\,-\,\,\,(III)$