The pair of complexes in which both complexes show same type of structural isomerism as well as same number of geometrical isomers.

Question

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[Co(NO₂)₂(NH₃)₄]Cl and [Fe(NH₃)₄(CN)₂]Br

Both complexes are of the type [MA₄B₂], which can exhibit 2 geometrical isomers: cis and trans.

In [Co(NO₂)₂(NH₃)₄]Cl, NO₂⁻ is an ambidentate ligand, so it shows linkage isomerism (nitro and nitrito forms).

In [Fe(NH₃)₄(CN)₂]Br, CN⁻ is also an ambidentate ligand, showing linkage isomerism (cyano and isocyano forms).

Thus, both complexes exhibit the same structural isomerism (linkage isomerism).

Also, both have the same number of geometrical isomers (cis and trans = 2).

Answer: (D)

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