B.Sc Chemistry Organic Functional Groups Question Paper 2009

CH 5505 – ORGANIC FUNCTIONAL GROUPS II

PART – A

Answer ALL the questions                                                                        (10 x2 = 20 marks)

1. Write the isomers of nitrobutane.
2. What is diazotization?
3. Explain with example D and L notation.
4. Mark R and S configuration for the following compounds

1.             ii)

 

1. Write the synthesis of acetoacetic ester by Claisen condensation.
2. How is diazomethane prepared?
3. What is Isoprene rule?
4. What is Fries rearrangement?
5. What are sulpha drugs?
6. Draw the structures of the following compounds  (i) α-pinene          ii) Camphor

 

PART – B

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

1. Explain the mechanism of Gomberg reaction.
2. Which of the following is more basic? p-nitro aniline or  p-Toludine.  Explain
3. Give an account of the optical activity of biphenyls.
4. Explain Walden inversion.
5. Establish keto-enol tautomerism exhibited by acetoacetic ester.
6. How will you synthesise the following from acetoacetic ester (i) Acetyl acetone  (ii) Crotonic acid?
7. Write briefly on Beckmann rearrangement.
8. How is isoquinoline prepared?
9. How does pyridine react with         i) NaNH₂      ii) n-ButylLithium        iii) CH₃ COCl/A1C1₃.
10. Explain the electrophillic substitution of reactions of pyrrole.
11. How will you prepare 1, 3, 5 trinitrobenzene?
12. Explain asymmetric synthesis.

 

 

 

PART – C

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

1. (i) How will you separate the mixture of amines by Hinsberg method.

(ii)Explain the coupling reactions of benzene diazonium chloride.

1. Explain the various methods of Resolution of a racemic mixture.
2. Write the preparation, properties and uses of diazoacetic ester.
3. Explain any two following rearragngements with mechanism

(i) Benzilic      (ii) Cope                     (iii) Curtius

27. i) Name the following compounds based on R and S configuration and represent it in

flying wedge,  sawhorse and Newmann projection formula.

 

 

(ii) Differentiate of enantiomersfrom diastereomers.

28. (i) Explain Hoffmann’s rearrangement.

(ii) Outline the synthetic utility of Benzene diazonium chloride.

 

 

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