Isomerism

Mediumchemistry

Pair showing ionization isomerism among the following:

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[Co(NH3)5Br]SO4 and [Co(NH3)5SO4]Br

[Pt(NH3)2Cl2] and [PtCl2(NH3)2]

[Cr(H2O)6]Cl3 and [CrCl(H2O)5]Cl2

[Fe(CN)6]3− and [Fe(CN)6]4−

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About This Question

Subject: chemistry
Chapter: coordination compounds
Topic: isomerism
Difficulty: Medium
Year: 2025

Solution

Correct Answer:

[Co(NH3)5Br]SO4 and [Co(NH3)5SO4]Br

Ionization Isomerism: Occurs when the composition of the coordination sphere ( $[\dots]$ ) and the ionizable counter-ion are interchanged.
Analysis:
- In $[C o (N H_{3})_{5} B r] S O_{4}$ , $S O_{4}^{2 -}$ is the counter-ion and gives a precipitate with $B a C l_{2}$ .
- In $[C o (N H_{3})_{5} S O_{4}] B r$ , $B r^{-}$ is the counter-ion and gives a precipitate with $A g N O_{3}$ .
Other pairs:
- The $C r$ pair represents hydrate isomerism (interchange of water).
- The $Pt$ pair is the same molecule written differently.
- The $F e$ pair represents different oxidation states.

This medium difficulty chemistry question is from the chapter coordination compounds, covering the topic of isomerism. It appeared in the 2025 exam.

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Isomerism

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