Transition metal compounds can show a number of different types of isomerism. Hydration isomerism is where different numbers of water molecules act as ligands. The name chromium (III) chloride is given to several chemical compounds with the formula $$\(\mathrm{CrCl}_{3} \cdot \mathrm{XH}_{2} \mathrm{O}\)$$, including a number of hydration isomers. Explain why the tetrahedral complex $$\(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right) \mathrm{ClBrI}\right]\)$$ exists as two optical isomers. (2) ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ (ii) Complete the diagram showing the two optical isomers of the tetrahedral complex. (1)

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