LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

WD 20

B.Sc. DEGREE EXAMINATION – CHEMISTRY

SIXTH SEMESTER – April 2009

CH 6607/CH 6601 – COORDINATION CHEMISTRY

 

 

 

Date & Time: 21/04/2009 / 9:00 – 12:00      Dept. No.                                                          Max. : 100 Marks

 

 

PART – A

Answer ALL the questions:                                                                                       (10 x 2 = 20)

 

1. Calculate CFSE value for octahedral complex.
2. Predict whether an octahedral complex formed by a ion is perfect or distorted. Explain.
3. on treatment with gives trans . Account for.
4. Give two examples for photo substitution reaction.
5. What is the principle involved in Metal template Synthesis? Give an example.
6. What are non-complementary electron transfer reactions? Give an example.
7. Explain the role of rhodium metal in Wilkinson’s catalysis.
8. Draw the structure of .
9. What is meant by chelate therapy? Mention its advantage.
10. What is the biological role of catalases in nitrogen fixations?

 

PART – B

 

Answer any EIGHT questions:                                                                               (8 x 5 = 40)

 

11. Describe with a neat diagram, the splitting of metal d-oribals in a square planar complex.
12. What are the experimental evidences for metal-ligand orbitals overlapping?
13. State Jahn Teller theorem. The octahedral complex formed by is distorted. Explain.
14. Discuss the mechanism of inner-sphere electron transfer reaction with a suitable example.
15. Explain associative mechanism of ligand substitution reactions in octahedral complexes.
16. Write a note on photoisomerisation reactions.
17. Describe the polarization theory of trans effect in synthesis of square planar complexes.
18. How do you prepare Schiff bases using template synthesis? Explain with two examples.
19. The IR spectrum of consists of two CO stretching bands at 1857 cm^-1 and 1897 cm^-1. Rationalize this.
20. Explain the polymerization of olefins using Ziegler-Natta catalyst.
21. What is the significance of contrast agents in MRI? Give three examples.
22. Write a note on iron-molybdenum center in nitrogenase enzyme.

 

 

PART – C

Answer any FOUR questions:                                                                                             (4 x10 = 40)

 

23. (a) Construct Metal orbitals and LGO suitable for and – bonding in Octahedral geometry  (5)

(b) Construct MO energy level diagram for .                                                            (5)

 

24. Define outer-sphere electon transfer reaction. Explain the mechanism with an example. What are the experimental evidences for outer sphere electron transfer?

 

25. (a) Explain dissociative mechanism of ligand substitution reactions in octahedral complexes.  (5)

(b) Describe the CF split of metal d-orbitals in octahedral geometry.                                              (5)

 

26. (a) Predict the stability of .                    (5)

(b) Draw the structure of (i) Fe₃ (CO)₁₂   (ii)Mn₂(CO)_10.                                                                 (5)

 

27. (a) What is meant by Cis effect? Explain with two examples.          (5)

(b) Describe the template synthesis of metal phthalocyanins.                                                         (5)

 

28. (a) Write a note on Wilkinson’s catalyst and hydrogenation of alkene using it.          (6)

(b) Write the structure of carboxypeptidase-A. What is its biological importance?                      (4)

 

 

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