M.Sc. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2017.
Third Semester
Chemistry
Paper III CONFORMATIONAL ANALYSIS ASYMMETRIC SYNTHESIS AND
ORGANIC PHOTOCHEMISTRY
2 20133
Time 3 Hours Max. Marks 75
SECTION — A
Answer any FIVE questions. 5 25 Marks)
Each question carries 5 marks.
1. Explain sterio chemistry of decalins.
2. Explain conformational structure of tropane.
3. Explain the topicity in molecules.
4. Explain about prochirality.
5. Explain lathanide shift reagents.
6. Explain Noyori catalyst.
7. Explain prelogs rule.
8. Explain photo reduction reaction.
SECTION — B
Answer ALL questions. 12½ 50 Marks)
9. Explain conformations of polysubstituted cyclohexanes, hydrindanes.
Or
10. Explain steric and sterio electronic effects in cyclic molecules.
11. Explain chiral NMR and chiral HPLC.
Or
12. Explain sterio selective reactions.

13. Explain Zimmerman traxel model.
Explain cope and Aza-cope reaction.
Or
14. Explain the enzyme mediated enantioselective synthesis.
Explain crams rule, sharpless epoxidation.
15. Explain sigmatropic reactions.
Explain photodimerisation, photo oxidation reactions.
Or
16. Explain
Norrish type II reaction.
Paterno-Buchi reaction.
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