Writing anything except Roll Number on question paper will be deemed as an act of indulging in unfair means and action shall be taken as per rules. प्रश्नपत्र पर रोल नम्बर के अतिररक्ि कुछ भी ललखना अनुचिि साधनों का प्रयोग माना जायेगा िथा तनयमानुसार काययवाही की जायेगी| Roll No._________________ MSc(Chemistry) Semester II MSCH211 – COORDINATION CHEMISTRY MODEL QUESTION PAPER Time: 3 Hrs Note: 1. All questions are compulsory in section A. The answers of these questions are limited upto 30 words each. Each question carries 2 marks. 2. Attempt FIVE questions in all from Section B, selecting ONE question either A of B from each question. Answer of each question shall be limited upto 250 words. Each question carries 6 marks. 3. Attempt 3 questions in all from section C. Answer of each question shall be limited upto 500 words. Each question carries 10 marks. SECTION A 1. a How molecular orbital theory of metal ligand bonding . complexes differs from the crystal field theory? in b What do understand by π acceptor ligands? . c What is trans effect? Explain with suitable example. . d The transfer of electron from [Cr(H2O)6]2+ to 3+ . [Co(NH 3)6] in aqueous medium is slower than the transfer from [Cr(H2O)6]2+ to [Co(NH3)5(OH)]2+ explain why? e Explain linkage isomerism using suitable example. . f. Explain why do square planar complexes do not exhibit optical isomerism? g Draw orgel diagram for the d2 ion in octahedral as well . as tetrahedral ligand field. h Detemine ground state term for Si and Cr3+? . i. What do understand by the plane polarised light? j. Explain the term ORD. SECTION B 2. A Electrostatic approach doesn’t correctly explain the . sequence of ligands in the spectrochemical series. How do these anomalies can be explained using molecular orbital approach? OR B Explain the bonding in tetrahedral complex using . molecular orbital theory. 3. A Explain the conjugate base mechanism (SN1CB) & give . evidences in support of this mechanism. OR B What do you mean by transition state theory of ligand . substitution reaction? How does following factors affect nature of mechanism for acid hydrolysis reaction? a) Charge on the substrate b) Inductive effect of ligands 4. A Explain geometrical isomerism in complexes with . coordination number 4 and 6. OR B Write a short note on racemisation reaction. . 5. A Using vector notations calculate ground state term for . the metal ion with d2 configuration? OR B What are Tanabe-Sugano diagrams? How these . diagrams are different from orgel and correlation diagrams? 6. A What do understand by charge transfer spectra? Why . does compounds showing such spectra are intesly coloured? OR B Write short notes on . a. Spin crossover. (3+3) b. Anamolous magnetic moments in solution due to solute-solvent interactions. 7. 8. 9. 10. 11. SECTION C Discuss π bonding in octahedral complexes on the basis of MOT. Discuss with example the lability and inertness of octahedral complexes according to VBT and CFT. What are electron transfer reactions? Explain the mechanism of one electron transfer reaction with suitable examples. What do understand by correlation diagram? Why correlation digrams are better than Orgel diagrams? Derive the correlation diagram of d2 ions considering only the highest multiplicity states. What are charge transfer transitions? How they explain the colour of various pigments on the basis of ligand to metal charge transfer transition?