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National Open University Exam Past Question – CHM 318 OCTOBER/NOVEMBER 2014 EXAMINATION

NATIONAL OPEN UNIVERSITY OF NIGERIA CHM 318 Natural Product Chemistry 1

14-16 AHMADU BELLO WAY, VICTORIA ISLAND LAGOS SCHOOL OF SCIENCE AND TECHNOLOGY OCTOBER/NOVEMBER 2014 EXAMINATION

 

 

 

CHM 318:                             Natural Product Chemistry 1

 

Time:                                    2 Hours

 

INSTRUCTION:                   Answer any four Questions

 

 

 

 

  1. 1. a) i. Define the following; Terpenes, Terpenoid (2 marks)
  2. Draw the structure of the following compounds; α-myrcene, cis-α-ocimene, 4-trans-6- trans- alloocimene. (1½ marks)
  3. b) Give 7 detailed elaboration on the importance of Terpen (14 marks)

 

 

  1. 2. a) i. State 2 acyclic representatives of Farsenans and draw the structure of the compound (

3 marks)

  1. Give two importance of each from 2ai. (4 marks)

 

  1. b) i. Draw the structure of Gossypol and write briefly on the comp (4 marks)
  2. Give a detailed elaboration of Diterpenes and list 5 examples of its class. (6½ marks)

 

  1. 3. a) i. Define a Steroid. (1 mark)
  2. Describe and draw the Structure of a Gonane.(3½ marks)
  3. b) Classify Steroids based on their Taxonomy and give examples of each. (3 marks)
  4. c) List the 4 groups of Vertebrate steroid and state 2 biological importance of e (10 marks)

 

  1. 4. a) i.Draw the Mevalonate pathway involved in Steroid synth (8 marks)
  2. Describe the Pathway. (3 marks)
  3. b) Define Steroidogenesis. (1 mark)
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  1. List the products of Human Steroidogenesis. (2½ marks)
  2. c) Write briefly on Degradation and Elimination of Steroid (3 marks)

 

 

 

 

  1. 5. a) i.State 5 properties of Alkaloid ( 5 marks)
  2. Describe the Mannich reaction involved in Alkaloid synthesisand show the reaction pathway. (3½ marks)
  3. b) List 5 mechanisms by which Dimeric Alkaloids are formed, stating one example in each. (5

marks)

  1. c) Enumerate on 2 applications of Alkaloids with one example in each. (4 marks)

 

 

  1. 6. a) Highlight the 5 major classes of Alkaloid and give one example in each. (7½ marks)
  2. b) In a tabular form, show the major groups, main synthesis steps and 2 examples of each of the following alkaloid derivatives; (10 marks)
  3. Tropane derivative
  4. β-Phenylethylamine derivatives iii. Spermidine derivatives
  5. Purine derivatives
  6. Oxazole derivatives

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