M.Sc. DEGREE EXAMINATION, FEBRUARY 2018.
Fourth Semester
Chemistry
Paper III PHYSICAL ORGANIC CHEMISTRY AND GREEN CHEMISTRY
(Non CBCS Old Regulation)
2 20143
Time 3 Hours Max. Marks 75
SECTION — A
Answer any FIVE questions. 5 25 Marks)
1. Explain the concept of Aromaticity.
2. Describe MO theory with an example.
3. Write a note on heavy Isotopic effects.
4. Write a note on the Taft model.
5. Explain Nucleofugacity.
6. Write a note on Ambivalent nucleophiles.
7. Explain about microwave effects.
8. Write a note on microwave assisted Hoffmann elimination.
SECTION — B
Answer any FIVE questions. 12½ 50 Marks)
9. Describe HMO method and apply to ethane energy orbitals in detail.
Or
10. Describe Conjugation and Hyperconjugation with examples.
11. Describe the derivation of Hammett equation.
Or
12. Explain about
Theories of substituent effects
Isotope effects.

13. Explain structural and electronic effects of SN1 and SN2 reactions.
Or
14. Explain each of the following
HSAB principle
Kinetic isotope effects
Intramolecular assistance.
15. Explain the Principles of Green Chemistry in detail.
Or
16. Explain about
Diels-Alder reaction
Orthoester Claisen rearrangement.