The compound Co(NH3)4BrSO_4 exhibits ionization isomerism. This occurs when the counter ion in a complex salt is itself a potential ligand and can displace a ligand that is
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d)
i)
The compound $\text{Co}(\text{NH}_3)_4\text{BrSO}_4$ exhibits ionization isomerism. This occurs when the counter ion in a complex salt is itself a potential ligand and can displace a ligand that is already in the coordination sphere.
ii)
The structural formulae of the isomers are:
1. $[\text{Co}(\text{NH}_3)_4\text{Br}]\text{SO}_4$ (Bromide is a ligand, sulfate is the counterion)
2. $[\text{Co}(\text{NH}_3)_4\text{SO}_4]\text{Br}$ (Sulfate is a ligand, bromide is the counterion)
e)
The complex $[\text{Cu}(\text{H}_2\text{NCH}_2\text{CH}_2\text{NH}_2)_2]^{2+}$ has a coordination number of 4 (each ethylenediamine ligand, $\text{H}_2\text{NCH}_2\text{CH}_2\text{NH}_2$, is bidentate). Copper(II) complexes with a coordination number of 4 typically adopt a square planar geometry.
5 (a)
i)
| Steps | Reagent and conditions |
| :---- | :--------------------- |
| i | $\text{Br}_2$, UV light / heat |
| ii | $\text{KCN}$ (or $\text{NaCN}$), ethanolic solution, heat (reflux) |
| iii | Dilute $\text{H}_2\text{SO}_4$ (or $\text{HCl}$ or $\text{NaOH}$), heat (reflux) |
| iv | Alcoholic $\text{KOH}$ (or $\text{NaOH}$), heat (reflux) |
| v | $\text{HBr}$, room temperature |
ii)
The structures of compounds D, E, and F are:
D: $\text{CH}_3\text{CH}_2\text{CH}_2\text{COOH}$ (Butanoic acid)
E: $\text{CH}_3\text{CH}=\text{CH}_2$ (Propene)
F: $\text{CH}_3\text{CH}(\text{Br})\text{CH}_3$ (2-Bromopropane)
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