Answer Happy

please answer all parts
Question 2 Answer all parts. (a) Determine the metal oxidation state and d-electron configuration in the following complexes (bpy = 2,2'-bipyridine): (4 marks) (i) [Fe(CsHs)2] (ii) [W(CO)4(PPh3)2] (iii) [Moz(CH3COO)4] (iv) MnO2 (b) What kind of electronic transitions are responsible for the colours of the following species? For each case, state the type of the electronic transition, the orbitals between which the transition occurs and briefly explain the reason for your assignment. (i) Ruby (contains Cr3+ in Al2O3), red. [2 marks] (ii) Sapphire (contains Fe2+ and Ti4in AlzO3), intense blue. [2 marks] (iii) Cr20-2, deep orange. [2 marks] (iv) [W04]?, colourless but shows a very strong band in the UV. [2 marks] (v) [Fe(bpy)}]?", deep red. [2 marks] (d) Consider the reaction: [Co(NH3)s(H20)]3+ + X[Co(NH3)sX]2+ + H20 + (i) Is this an electron transfer or a substitution reaction? Justify your answer. [2 marks] (ii) The reaction rate changes by less than a factor of 2 when X is varied among Cl, Br, N3 , and SCN . What does this observation say about the reaction mechanism? [4 marks]