LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc.

LM 21

DEGREE EXAMINATION –CHEMISTRY

SIXTH SEMESTER – APRIL 2007

CH 6604 – NATURAL PRODUCTS

 

 

Date & Time: 20/04/2007 / 9:00 – 12:00          Dept. No.                                                     Max. : 100 Marks

 

 

 

 

PART-A                                      

Answer ALL questions.                                                                                              (10×2=20)

1. What happens when naphthalene is treated with ozone?
2. How will you synthesise phenanthrene from benzil?
3. Write any one example for ring expansion reaction of pyrrole.
4. How does thiophene react with mandelic anhydride?
5. What are alkaloids? How are they classified?
6. How are terpenoids isolated?
7. Write any four properties of nicotine.
8. What is isoprene rule?
9. Write the basic structure of flavone and flavonol.
10. What are natural pigments? Give an example.

 

PART-B

Answer any EIGHT questions.                                                                                  (8×5=40)

11. Explain the Hawarth synthesis of naphthalene.
12. What happens when the following reagents are treated with pyrrole?

(a) SO₂Cl₂/ether  (b) K₂CO₃/heat   (c) CHCl₃/aq.KOH  (d) C₆H₅N₂Cl   (e) SO₃/pyridine

13. Write a note on Hofmann’s exhaustive methylation method of degradation of alkaloids.
14. Explain the synthesis of piperic acid from catechol.
15. What are terpenoids? How are they classified on the basis of the number of isoprene units?
16. Write short notes on isolation of essential oils from plants?
17. How is camphor synthesized from camphoric acid?
18. Give the different products obtained on the oxidative degradation of α-pinene.
19. Explain the synthesis of menthol.
20. Explain the biological importance of anthocyanines.
21. Write a note on carcinogenic hydrocarbons.
22. Elucidate the structure of caffeine.

PART-C                                                 

Answer any FOUR questions.                                                                                   (4×10=40)

23. a) Explain the orbital structure of naphthalene. (5)
24. b) Draw the flow chart of isolation of anthracene. Explain. (5)
25. Discuss the constitution and importance of nicotine.
26. Elucidate the structure of camphor.
27. Explain the structure and synthesis of cyanidine chloride.
28. Discuss the structure of quercetin.
29. Elucidate the structure of uric acid.

 

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