Exam Details

Subject reactive intermediates photochemical and concerted reactions
Paper
Exam / Course m.sc in chemistry
Department
Organization alagappa university
Position
Exam Date April, 2017
City, State tamil nadu, karaikudi


Question Paper

M.Sc. DEGREE EXAMINATION, APRIL 2017
Second Semester
Chemistry
REACTIVE INTERMEDIATES, PHOTOCHEMICAL AND
CONCERTED REACTIONS
(CBCS 2015 onwards)
Time 3 Hours Maximum 75 Marks
Part A (10 x 2 20)
Answer all questions.
1. Define carbanions.
2. Write the synthesis of organolithium by nucleophilic
addition reaction.
3. What is meant by ylids compound and write down its
significance?
4. What is classical and non-classical carbocation?
5. How to generate carbenes by insertion reaction?
6. Define the structure of nitrene.
7. Define Baidwin's rule.
8. What is effect of temperature on photochemical reaction?
9. State Woodward Hoffmann rule with an example.
10. Define cheletropic elimination.
Sub. Code
536202
RW-183
2
ws11
Part B x 5 25)
Answer all questions choosing either or
11. Discuss about enolates and enamines.
Or
Discuss the stereochemical structural aspects of
carbanions.
12. Explain Peterson olefination.
Or
Explain pinacol pinacolone rearrangement.
13. Write a note on Wolff rearrangement.
Or
Discuss the mechanism of Beckmann
rearrangement reaction.
14. Explain the rearrangement reaction for generation
of radical intermediates.
Or
Write a short note on Ullmann reaction and
Sandmeyer reaction.
15. Explain cycloadditron reaction with one example.
Or
Discuss about Cheleotropic and xanthates
elimination reaction.
RW-183
3
ws11
Part C x 10 30)
Answer any three questions.
16. Explain the carbanion name reaction Claisen,
Knoevenegal and Stobbe reaction.
17. Explain briefly Zimmermann rearrangement, Noncyclic
rearrangement and Wallach rearrangement.
18. Explain the structure, generation, addition and
rearrangement reactions of carbenes.
19. Explain Norrish land II type reactions.
20. Write briefly an account of pericylic reaction such as
Claisen, Cope and Diels-Alder reactions.
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Subjects

  • chemistry of inorganic complexes
  • elective – corrosion chemistry
  • elective — green chemistry
  • elective — industrial chemistry
  • elective — molecular photochemistry
  • elective — pharmaceutical chemistry
  • elective — polymer chemistry
  • inorganic chemistry
  • inorganic chemistry - ii
  • inorganic chemistry — iii
  • instrumental methods of analysis
  • natural products and introductory biochemistry — (elective iii)
  • organic chemistry – iii
  • organic chemistry — i
  • organic chemistry — ii
  • physical chemistry
  • physical chemistry – i
  • physical chemistry – iii
  • physical chemistry — ii
  • quantum chemistry group theory kinetics and surface chemistry
  • reactive intermediates photochemical and concerted reactions
  • structural inorganic chemistry and photochemistry