Nalanda Open University
Annual Examination 2016
B.Sc. Chemistry (Honours), Part-III
Paper-VII
Time: 3.00 Hrs. Full Marks: 80
Answer any five questions. All questions carry equal marks.
1. Define the aromaticity, making a special mention of Hockle Rule. Discuss
modern theory of aromaciticity. Explain why fulvene and Azulene are
aromatic.
2. What are flavones? Discuss the degradative and synthetic method to
establish the structure of flavones. How is a flavone related to a flavanil?
3. Discuss the preparation, mechanism and application of any two of the
following reagents:-
Hydrogen peroxide
Periodic acid
Lithium aluminum hydride.
4. Give the synthesis of following
Malachite Green Congo red Methyl orange Phenolphthalein
5. Discuss the prepration, mechanism and application of any two of the
following reagents:-
N-Brom succinimide Peractic acid lead tetra acetate
6. Discuss the degrative and Synthetic method to establish the structure of
Annthraceine. Why in Annthraceine, the attack of an electrophile,
prefretially occours at C9 C10? How will you, synthesis Anthraquinone from
Anthracine?
7. How will you prove the presence of two fused benzene nepthalene into β
naphol naphtylamine.
8. Discuss with suitable examples
Plane of symmetry Reflection of Symmetry
9. Explain Cl group is activating yet it is ortho and para directing in
electrophilic aromatic substitution reactions. Discuss briefly the method of
isolation of ortho, para and meta isomer from Obtained by disubstitution
of benzene.
10. Decribe the sythesis of quinoline by Skraup and Fridlander method. How
does quinoline react with:-
Mixture of funring HNO3+H2So4
Sodamide