LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

SIXTH SEMESTER – APRIL 2011

CH 6610/CH 6604 – CHEMISTRY OF NATURAL PRODUCTS

 

 

 

Date : 09-04-2011              Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

PART – A

 

ANSWER ALL THE QUESTIONS                                                                           (10×2=20 marks)

1. How is N-methyl group identified in alkaloids?
2. What happens when piperine is subjected to hydrolysis with NaOH?
3. Mention the products of ozonolysis of geraniol.
4. Draw the structure of vitamin-A. How is it structurally related with β-carotene?
5. What are the uses of anthocyanidin.
6. What are flavones?
7. Name the products obtained when uric acid is oxidized with HNO₃.
8. Draw the structures of caffeine and theophylline.
9. Name the chromophores and auxochromes present in alizarin and methyl orange.
10. What are phthalein dyes? Give examples.

PART – B

  ANSWER ANY EIGHT QUESTIONS                                                                      (8×5=40 marks)

 

11. a) What is isoprene rule? b) How are terpenes classified?
12. Outline the synthesis of piperine.
13. Establish the structure of coniine and give its synthesis.
14. Elucidate the structure of menthol.
15. a) What happens when camphor is i) oxidized and ii) reduced?
16. b) Show that camphor is bicyclic.    (3+2)
17. Give any one synthesis of flavones.
18. a) What are anthocyanins? What are the two components of anthocyanins?
19. b) What happens when hirsutidin chloride is hydrolyzed with Ba(OH)₂ ?    (3+2)
20. How is uric acid synthesized from urea?
21. What are purines? Mention their biological importance.
22. Discuss the structure of caffeine.
23. Discuss briefly on the relationship between color and constitution of dyes on the basis of

resonance theory.

22. What are azo dyes? Describe the preparation and applications of any one azo dye.

 

PART – C

ANSWER ANY FOUR QUESTIONS                                                                   (4×10=40 marks)

23. Establish the structure of nicotine and give its synthesis.
24. Discuss the structure of citral and its synthesis.
25. How will you arrive at the structure of quercetin?
26. Outline the synthesis of oesterone.
27. Explain the structure and synthesis of cyanidin hydrochloride.
28. a) Explain the terms i) bathochromic shift ii) hypsochromic shift.
29. b) How are the following compounds prepared?   i) Alizarin  ii) Indigo                                                                                                                                                                         (4+6)

 

 

 

 

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