Coordination Chemistry, Reaction Mechanism and Spectral properties — DU Physical Science courses pertaining to Chemistry Previous Year Question Papers

2. Attempt four questions in all. (i) Discuss mechanism of Hydrolysis reaction with one example of octahedral (5) (ii) Utilizing the trans effect, write synthesis of trans-[Pt(NH,) (NO,)C1,1 from (5) (iii) Write differences between Dissociative (D) mechanism and Associative (A) mechanism in octahedral complex. (5) . 2. (i) Give the mechanism of the following reaction : (5) Also, explain why this reaction is slow. (ii) The ligand transfer is not a requirement of the inner sphere mechanism. (5) Justify this statement with an example. (iii) Discuss remote attack and adjacent attack with example. 3. (i) Draw the molecular orbital energy level diagram for a-bonding in octahedral (5) (ii) What are the main features of ligand field theory? (5) (iii) Discuss higher charge on metal causes greater crystal field splitting. (5) (ii) How does covalent bonding in complexes have been explained by ligand field theory? (iii) What are the shortcomings of crystal field theory? (5) (i) Discuss Metal to Ligand Charge transfer (MLCT) transitions in an octahedral complex. (ii) Discuss Tanabe - Sugano diagram of d' system. (5) (ii) What is Laporte's Selection rule. Discuss relaxation in Laporte's selection rule. (i) The absorption spectrum of [Cu(H,O),7* exhibit two closely overlapping band rather than a single band. Discuss. (ii) Write differences between Orgel diagram and Tanabe- Sugano diagram. (iii) Discuss Nephelauxetic effect. (5)