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Posted Date: 29 Sep 2009 Posted By: garima Member Level: Gold
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2007 Madurai Kamaraj University M. Phil Bio Chemistry m.phill Question paper
Paper III-course work 2
Time: three hours maximum: 100 marks
Answer all questions.
1. Explain the origin and application of over Hauser effect.
2. How would you achieve the chemo selective oxidation of alcohols into aldehydes?
3. Construct the molecular orbital diagram for MX6 species and explain its charge transfer spectrum.
4. With an example explain how an antibiotic could inhibit aspirate transaminase.
5. What are katapinands? Explain their significance.
6. (a) Discuss the pulse sequence of the inadequate experiment.
(ii) With a suitable inversion experiment.
(iii) Describe the principle behind 2D_NMR spectroscopy.
Or
(b) (i) explain the meaning of evolution time in pulse experiments.
(ii) Draw the scheme of DEPT pulse sequence and vectors diagram for an AX system and explain.
(iii) What is 2D FT-NMR? What is it possible?
7. (a) (i) with one example of an organic compound discuss the retro synthetic analysis.
(ii) How do a, ß – unsaturated nitro compounds react with ynols? Give the mechanism.
(iii) Explain how robin son annulation is useful in the synthesis of isonootkatone.
8. (a) (i) prove that carbon atom has fifteen microstates.
(ii) Explain how group theoretical terms are obtained in weak and strong crystal field limits in oh point group.
(iii) Mercury (II) iodide is brick red colored despite mercury (II) having d10 configuration .give reason.
Or
(b) (i) deduce the ground state terms symbol d2 configuration.
(ii) consider the crystal field spectra of high spin and low spin 3d5 system and analyses the spin allowed transition and energy associated with them.
(iii) Bismuth (III) iodide is orange red in colors despite a d10 configuration is Bi (III).explain. (4)
9. (a) (i) with two examples prove that active of enzymes. Can be reproduced with simple organic models.
(ii) Discuss the analogy between biochemical transformation and organic reaction.
(iii) Write notes on naturally occurring irreversible enzyme inhibitors.
Or
(b) (i) give two examples of transition state analogs. Explain how effectively they mimic the real transition state.
(ii) Explain the affinity-labeling experiments developed by Shaw.
(iii) What is molecular recognition? Explain its application in enzyme chemistry.
10. (a) (i) with a suitable example discuss the intermolecular C-H pie interactions.
(ii) How are fullerenes characterized?
(iii) Discuss the Emil-fisher’s model of enzymes.
(b) (i) explain the formation of host-gust complex in cyclodextrins.
(ii) Discuss the different physical tools employed to establish the structure of C60 and C70.
(iii) What are crown ethers? Give two examples. Explain how alkali metal ions complexes with them.
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