LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

WD 10

THIRD SEMESTER – April 2009

CH 3502 – ORGANIC FUNCTIONAL GROUPS – I

 

 

 

Date & Time: 02/05/2009 / 9:00 – 12:00       Dept. No.                                                       Max. : 100 Marks

 

 

PART-A                                      

Answer ALL questions.                                                                                  (10 x 2 = 20)

 

1. What is Saytzeff rule? Give an example?
2. What happens when n-propyl bromide is treated with alcoholic KOH?
3. How will you distinguish between methyl alcohol and ethyl alcohol?
4. Write any two drawbacks of Friedal-Crafts reaction with an example.
5. How will you synthesise diethyl ether from ethyl alcohol?
6. Give the general mechanism of nucleophilic addition reactions of carbonyl compounds.
7. Write the mechanism of Cannizzaro reacton.
8. Arrange the following compounds in order of increasing acidity and explain you answer.

HCOOH,   ClCH₂COOH, CH3COOH

10. How will you synthesise succinic acid from ethylene?

 

PART-B                                     

Answer ANY EIGHT questions.                                                         (8 x 5 = 40)

 

11. a) What happens when propene treated with HBr in the presence of organic peroxides?

Explain.

1. b) Discuss the mechanism of E2 reaction of alkyl halides.
2. a) Why do aryl halides are less reactive towards nucleophilic displacement reactions?
3. b) Write the general mechanism of aromatic electrophilic substitution reaction.
4. How will you convert primary alcohol into tertiary alcohol? Explain.
5. Discuss the mechanism of sulphonation reaction of phenol.
6. Write a note on: Kolbe Reaction.
7. Explain the mechanism of the reaction between aromatic aldehydes and aqueous alcoholic KCN.
8. Write a note on: Norrish II reaction.
9. How will you synthesis cinnamic acid from benzaldehyde? Give the mechanism.
10. a) n-Butyl ether(bp 118 °C) has a much higher boiling point than its isomer diethylether (bp 35 °C).Explain.
11. b) Write a note on: Cleavage of ethers by acids.
12. Discuss the effect of the substituents on acidity of carboxylic acids.
13. Write the mechanism of esterification reaction.
14. How is adipic acid synthesized from cyclohexane?

 

 

 

 

 

PART-C                                    

Answer ANY FOUR questions.                                                                    (4 x 10 = 40)

 

23. a) Write any five differences between SN1 and SN2 reaction mechanism. (5)
24. b) Discuss the mechanism of E2 and explain any three evidences. (5)
25. Complete the following reactions with mechanism. (5+5)
26. a) Write the mechanism of wittig reaction. (5)
27. b) Write a note on: Michael addition. (5)
28. a) What is Williamson’s synthesis? (3)
29. b) What happens when glycerol treated with KHSO₄? (3)
30. c) How will you convert acetaldehyde into paraldehyde?                            (2)
31. d) Give the product when acetone undergoes the condensation in dry HCl. (2)
32. Write the complete reaction for the following conversions.                           (4 x2.5)
33. a) Ethylene bromide into succinic acid b) Butene into maleic acid
34. c) Ethyl acetoacetate into crotonic acid d) Allyl alcohol into acrylic acid
35. Predict the products of the following reactions. (5×2)

 

 

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