N A L A N D A O P E N U N I V E R S I T Y
M.Sc. Chemistry, Part-II
PAPER-XIV
(Photochemistry and Pericyclic Reaction)
Annual Examination, 2018
Time 3 Hours. Full Marks 80
Answer any FIVE Questions. All questions carry equal marks.
1. Give mechanism of Norrish type I process. How many types of carbonyl compounds gives this
reaction
2. Write a note on Conrotatory motion and disrotatory motion.
3. Explain Barton reaction. Give its synthetic use and application.
4. Give the mechanism for the rearrangement of cyclo dienones and explain the rearrangement
of cyclodienones involving diradical intermediate in presence of hydrogen donor and in
absence of hydrogen donor.
5. Ketones mainly give four types of Photochemical reactions. Give name of the reactions with
examples.
6. Discuss photochemistry of intermolecular dimerisation cycloaddition.
7. Write short notes on the following
Photochemistry of aromatic compounds. Franck Condon Principle.
8. Discuss Zimmerman mechanism for the rearrangement given by 5-dienones.
9. Give molecular diagram of
3-Pentadiene 5 heptatriene
10. Give the mechanism of Norrish type process. Which ketones are most common class of
compound of -cleavage and why