Which of the following complexes show linkage isomerism?

(a)Co(NH3)5(NO2)2+(b) [Co(H2O)5CO]3+ (c) [Cr(NH3)5SCN]2+(d) [Fe(en)2Cl2]+

Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, c)


Coordination compounds containing a ligand with more than one non-equivalent binding

Position (known as ambident ligand) show linkage isomerism

Co(NH3)5(NO2)+ contains NO2 which have two donor sites N and © can be shown by

arrow (9) as                       


Cr(NH3)5SCN2+ contains SCN which have two different donor sites S and N can be shown by arrow () as


Hence,Co(NH3)(NO22+ and Cr(NH3)5SCN)2+ show linkage isomerism. While

Co(H2O5CO)3+ and Fe(en)2Cl2+ has no ambident ligand, So, these two will not show

linkage isomerisrn.

Hence, options (a) and (c) are correct choices.