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National Open University Exam Past Question – CHM 305 2013 OCTOBER EXAMINATION

NATIONAL OPEN UNIVERSITY OF NIGERIA

14/16, Ahmadu Bello Way, Victoria Island, Lagos

 

SCHOOL OF SCIENCE & TECHNOLOGY

213 OCTOBER EXAMINATION

 

 

 

Course Code: CHM 305

Course Title: Organic Chemistry III Course Unit: 3 Credit Units

Time: 2½ Hours

 

Instruction:   Answer any five question

 

 

1. i 4-ethyl phenol
  ii Phenyl methanol
  iii 2-methylpropan-2-ol
  iv Ethoxy benzene
  v Tetrahydrofuran
  vi 4-methylbenzoic acid
  vii 3-chloropropanoyl chloride

 

Write the structural formulae of the following compounds

(14 marks)

 

2. (a) Using THREE relevant examples, discuss the reactions of alcohols involving the

R – OH bond cleavage

(b) State and discuss the Saytzeff’s rule.

 

 

(9 marks) (5 marks)

 

3.

 

(a) List the methods of preparing ethers.

(b) Using appropriate examples, discuss the followings in details: (i) Williamson Synthesis

 

(4 marks)

 

(5 marks)

  (ii) Oxymecuration-demecuration (5 marks)
 

4.

 

(a) With the aid of relevant chemical equations discuss briefly the preparation of fatty

 
   

(b) Write a short note on the Cannizzaro reaction; given an example.

 
  (c) How would you convert a carboxylic acid into acid anhydrides?  
 

5.

 

(a) (i) What is hydrolysis?

 

(3 marks)

  (ii) Describe the hydrolysis of ethanamide under acidic and alkaline conditions. (6 marks)
  (b)  What are the uses of carboxylic acids? (5 marks)

 

acids from Grignard’s reagent and CO2

 

  1. 6. (a)  Highlight the similarities and differences between Friedel – Craft acylation and Friedel-craft alkylation reactions.                                                                                                                    (6 marks)

(b)  Discuss the preparation of ketones from alcohols and give a specific example.             (8 marks)

 

  1. 7. (a) Write the structures of :
  2. i) β-fructopyranose ii)           maltose

iii)          sucrose                                                                                                                                   (6 marks)

(b) Discuss briefly the chemical properties of starch                                                                    (4 marks)

(c) State the uses of starch.                                                                                                              (4 marks)

 

 

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