1. Show a three-centre two-electron bonding interaction and explain how this confers
stability to the constituent atoms.
2. Use an equation to exemplify the typical reactions for such electron deficient species.
3. Use a suitable example to illustrate the listed reaction types as they occur in metal alkyl
(i) Oxidative addition
(iii) Reductive elimination
4. Use a diagram to show what you understand by back-bonding.
5. Describe the back bonding you would expect to observe if carbon monoxide coordinates to
iron in Haemoglobin and hence rationalize its toxicity to mammals.
6. What is it about Haemoglobin that allows iron to stay in a low oxidation state (Fe 2+) when
it coordinates to oxygen instead of becoming oxidized to Fe3+ ?
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