Madurai Kamraj University (MKU) 2006 M.Sc Chemistry ", 2 - ORGANIC " - Question Paper
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It's For "M.SC IN IN CHEMISTRY-MAY 2006 examination ques. Papers ", It'a Course in "Madurai Kamaraj University" or %MK University% in Distance Education Mode
The paper Name Is "M.SC CHEMISTRY,PAPER two - ORGANIC CHEMISTRY"
This ques. Paper is applicable for those who joined on or after MAY 2006 .
MAY 2006
(6 pages)
5552/MC2
Paper II ORGANIC CHEMISTRY I
(i) Hyperconjugation.
(ii) Taft equation.
UNIT II
4. (a) What do you understand by the terms nucleophilicity and basicity? (2)
(b) What is the major product obtained during FriedelCraft's reaction of n-propyl chloride with benzene in presence of anhydrous AICI3. Justify your answer. (2)
5. (a) Discuss nucleophilic substitution at vinylic carbon. (6)
Or
(b) Explain SnAt mechanism with suitable examples. (6)
6. (a) Give an account of the following :
(i) AAC2 mechanism
Or
(b) (i) Discuss the effect of substrate structure, nucleophile and leaving group on Sn2 reaction. (6)
(ii) Account for the observation that O-Bromoanisole on treatment with KNHs in liquid NHa gives m-anisidine, (4)
UNIT III
7. (a) State Bredt's rule. Explain with an example.
(2)
(b) What is a carbenoid? Explain its reaction with an alkene. (2)
8. (a) Elimination of meso - 2, 3-dibromobutane gives trans-2-butene while racemic -2, 3-dibromobutane gives cis-2- butene. Explain. What is your conclusion from these reactions? (6)
Or
(b) Explain the mechanism and applications of Perkin reaction. (6)
9. (a) (i) With suitable examples, explain regio selectivity and che mo selectivity in addition reactions. (6)
(ii) Outline the preparation and synthetic utility oflithium dimethyl cuprate. (4)
(b) Write notss on :
(i) Chugaev reaction.
(ii) Reformatsky reaction.
(iii) DielsAlder reaction. (3 + 3 + 4)
UNIT IV
10. (a) Differentiate between enantiomers and diastereomers. (2)
(b) Define a prochiral centre and give an example of a molecule that contain this centre. (2)
11. (a) State and illustrate Cram's rule. (6)
Or
(b) Discuss free radical oxidation reactions with suitable examples. (6)
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12. (a) Describe any two chemical methods and any two physical methods of determining configuration of geometrical isomers. (10)
Or
(b) Write briefly on :
(i) Biphenyl isomerism.
(ii) Hunsdiecker reaction, (5 + 5)
UNITV
13. (a) Write the structures of indigo and benzothiazole. (2)
(b) What happens when
(i) imidazole is treated with perbenzoic
acid.
(ii) Caffeine is oxidised with KClO.s/HCl. (2)
14. (a) Discuss briefly on.
(i) Baker-Venkataraman rearrangement.
(ii) Fischer indole synthesis. (6)
Or
(b) How are the following prepared?
(i) Uracil
(ii) Coumarin, (6) 15. (a) How is the structure of uric acid elucidated?
Or
(b) Give an account of the chemistry t anthocyanins. (1C
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(a) Distinguish between transition state and intermediate. (2)
(b) Azulene has appreciable dipole moment. Why? (2)
2. (a) Explain the rules for writing resonance structures. (6)
Or
(b) Discuss the concept of antiaromaticity and homoaromaticity. (6)
3. (a) (i) Discuss the factors which affect the s tability of c arbocations, (6)
(ii) Explain primary and secondary kinetic isotope effects with suitable examples. (4)
Or
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