LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

WD 23

SIXTH SEMESTER – April 2009

CH 6610 / 6604 – CHEMISTRY OF NATURAL PRODUCTS

 

 

 

Date & Time: 23/04/2009 / 9:00 – 12:00  Dept. No.                                                  Max. : 100 Marks

PART – A

Answer ALL the questions:                                                             (10 x 2 = 20)

1. What is Zeisels method?
2. Predict the product of complete Hoffmann’s exhaustive methylation of piperidine.
3. What are flavones?
4. Explain the geometrical isomerism exhibited by citral.
5. Write down the Robinsons Synthesis of anthocyandin.
6. Predict the product of KoH fusion of cyandine chloride.
7. What happends when uric acid treated with Conc. HNO₃.
8. How will you convert uric acid to Theophylline.
9. Write the structure of alizarin.
10. What will be the product selenium distillation of cholestrol.

PART – B

Answer any EIGHT questions:                                                                   (8 x 5 = 40)

11. How will you synthesis piperine.
12. What are anthocyanisis? Give exmaples.
13. What are the various conformation exhibited by Menthol.
14. Predict the Ozonolysis product of b–ionone.
15. What happens when Geranic acid is treated with cold alkaline potassium permanganate solution.
16. How flavones are prepared by Baker-Venkatraman Synthesis.
17. Write down the Traubes Synthesis of Caffeine.
18. Write down the synthesis of Camphornic acid.
19. Explain the nature and position of side chain in cholestrol.
20. Write the synthesis of Alizarin.
21. Briefly elucidate the structure of Indigoitin.
22. What are purines? What are all its biological importance.

PART – C

Answer any FOUR questions:                                                                     (4 x 10 = 40)

23. Elucidate the structure of papaverine.
24. Explain the general methods of structural clucidation of alkaloids with suitable examples.
25. Explain any two of the following:
26. Cartenoids
27. Biological properties of papaverine
28. Spectral properties of steroids
29. Isoprene rule.
30. Write down the synthesis of Oestrone.
31. Write the synthesis of any two (i) Conine (ii) Nicotine     (iii) Indigotin
32. Write the importance and structural determination Quercetin.

 

 

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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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