Complex compounds that have the same molecular formula but have different structural/space arrangements of ligands around central metal atom/ion are called isomers, these are of two types namely structural and stereoisomers.
Q. Complex species that exhibits isomerism is:

Options

A. `[Ag(NH_(3))_(2)]^(+)`
B. `[Co(NO_(2))(NH_(3))_(5)]^(2+)`
C. `[PtCl_(2)(en)]`
D. `[CoCl(NH_3)_(5)]^(2-)`

Answer

B