Question
Complex species that exhibits isomerism is:

Answer

None of the given complexes can exhibit either geometrical or optical isomerism. But the complex $\ce{[Co(NO_2​)(NH_3​)_5​]^{2+}}$  shows linkage isomerism as it contains nitro group which is ambidentate ligand and can be attached through either $N$ atom or $O$ atom.

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