M.Sc. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2017.
Third Semester
Chemistry
Paper II ASYMMETRIC SYNTHESIS AND ORGANIC PHOTO CHEMISTRY
2 20132-A
Time 3 Hours Max. Marks 70
SECTION — A
Answer any FIVE questions. 6 30 Marks)
1. Explain about stereoheterotopic molecules.
2. Explain Shift reagents.
3. Explain Prelog's rule.
4. Explain Cram's rule.
5. Explain singlet and triplet states.
6. Explain photoreduction.
7. Explain electrocyclisation reactions.
8. Explain methane reaction.
SECTION — B
Answer ALL questions. 10 40 Marks)
9. Explain in detail about topocity, HPLC.
Or
Explain Chiral Hplc, Chiral NMR, Chiral reagents.

10. Explain Diels-Alder reaction, reduction with CBS.
Or
Explain Sharpless, Jacobsen epoxidations.
11. Explain Jablonski diagram in detail.
Or
Explain reactions of triplet states and singlet states of carbonyl compounds.
12. Explain photochemistry of benzene derivatives.
Or
Explain Norrish type-I and type-II cleavages.
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