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, 2016
Time 3 Hours. Full Marks 80
Answer any FIVE Questions.
All questions carry equal marks.
1. Give the mechanism of Norishtype(II) process. Which ketones are most common class of
compound of -cleavage and why
2. Give mechanism of Norrish type I process. How many types of carbonyl compounds gives this
reaction
3. Discuss Zimmerman mechanism for the rearrangement given by 5-dienones.
4. Give the mechanism of the chelotropic cycloaddition reaction between, Alkene and
Carbene, Alene and So2.
5. Write a note on Controtatory motion and disrotatory motion.
6. Explain Barton reaction. Give its synthetic use and application.
7. Give the mechanism for the rearrangement of cyclo dienones. And explain the rearrangment
of cyclodienones involving diradical intermediate in presence of dydrogen donor and in
absence of hydrogen donor.
8. Answer the following question for molecule orbitals of 5-hexaterine.
Which are the bonding orbitals and antibonding orbitals.
Which orbitals are HOMO and LUMO in ground state and excited state.
Which orbitals are symmetric and asymmetric with respect to mirror plane and C2 axis.
9. Kitones mainly give four types of photochemical reactions. Give name of the reactions with
examples.
10. Discuss photochemistry of intermolecular climeristin by cycloaddition.