This complex will have three linkage isomers as follows
\(\left[ Pt ( en )\left( NO _{2}\right) 2\right] I\)
\(\left[ Pt ( en )\left( NO _{2}\right)( ONO )\right] II\)
\(\left[ Pt ( en )( ONO )_{2}\right] III\)
$(i)\, [CoCl_3 (NH_3)_3]$ $(ii)\, [Co(en)_3]Cl_3$
$(iii)\, [Co(C_2O_4)_2(NH_3)_2]^-$ $(iv)\, [CrCl_2(NH_3)_2(en)]^+$