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Answer the following.
What type of structural isomers are and ? How can they be distinguished by using a chemical test?
What type of structural isomers are $[\text{Pt}(\text{NH}_3)_3\text{Br}]\text{NO}_3$ and $[\text{Pt}(\text{NH}_3)_3(\text{NO}_3)]\text{Br}$? How can they be distinguished by using a chemical test?
Answer
Answer
Official answer keyThey are ionisation isomers, as they give different ions in solution.
| Test | $[\mathrm{Pt(NH_3)_3Br}]\mathrm{NO_3}$ | $[\mathrm{Pt(NH_3)_3(NO_3)}]\mathrm{Br}$ |
|---|---|---|
| Ions in solution | $[\mathrm{Pt(NH_3)_3Br}]^+$ and $\mathrm{NO_3^-}$ | $[\mathrm{Pt(NH_3)_3NO_3}]^+$ and $\mathrm{Br^-}$ |
| Add $\mathrm{AgNO_3}$ solution | No precipitate | Pale yellow precipitate of AgBr |
| Brown ring test (freshly prepared $\mathrm{FeSO_4}$ and conc. $\mathrm{H_2SO_4}$) | Brown ring formed | No brown ring |
From ISC 2027 Specimen Chemistry Paper 1, question 20(ii).
Check your working with the Coordination complex analyser: hybridisation, shape, magnetic moment, CFSE, isomers and the IUPAC name of a complex.