M.Sc. DEGREE EXAMINATION, APRIL/MAY 2018.
Second Semester
ORGANIC CHEMISTRY — II
2 20122-A
Time 3 Hours Max. Marks 70
SECTION — A
Answer any FIVE questions. 6 30 Marks)
1. Explain stability of carbocations and carbanions.
2. Explain Beckmann rearrangement.
3. Explain frontier orbital diagrams of 5 hexatriene.
4. Explain Aza-cope arrangement.
5. Explain Swern oxidation.
6. Explain BH3 and AlH3. And give two examples.
7. Synthesize 3-Triazine
8. Structure of Acridine Chromone.
SECTION — B
Answer ALL questions. 10 40 Marks)
9. Explain rearrangements with electron deficient carbon.
Or
10. Explain synthesis, stability of Carbene and Nitrenes.
11. Explain claisen and cope rearrangements.
Or
12. Give PMO approach of electrocyclic reactions.

13. Explain various reduction reactions.
Or
14. Explain prevost and wood word oxidation.
15. Synthesis and reactivity of Indole, Benzothiphene and coumarin.
Or
16. Synthesize 3-Triazole, benzodiazepines.
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