N A L A N D A O P E N U N I V E R S I T Y
M.Sc. Chemistry, Part-I
PAPER-III
(Organic Chemistry)
Annual Examination, 2018
Time 3 Hours. Full Marks 80
Answer any FIVE Questions.
All questions carry equal marks.
1. Explain the mechanism of Bimolecular Elimination reaction with suitable examples.
2. Write short note on any Two of the following
Hammond Postulate.
Free radical rearrangement.
Sandmeyer reaction.
3. What do you understand by Carbocations Explain their stability.
4. Explain the mechanism of following reaction
Benzoin Condensation
Gattermann-Koch reaction.
5. Complete the following reaction and outline its mechanism
6. Discuss the mechanism of ArSN1 Reaction. Give atleast three examples.
7. Discuss the mechanism and stereo chemistry of free radical bromination of 1 bromo 2
methyl butane.
8. Resonance energy of benzene is much more higher than 3 butadiene, why
Discuss aromaticity of non-benzoid aromatic compounds.
9. What are the conditions that favour E 1cb mechanism in an elimination reaction Illustrate
with two examples.
10. Write short notes on any Two of the following
Aldol addition reaction.
Mannich reaction.
Perkin reaction.
Knoevenagal reaction.