CLASS: B.Sc. CHEMISTRY
14A/ 160
St. JOSEPH’S COLLEGE (AUTONOMOUS) TIRUCHIRAPPALLI – 620 002
SEMESTER EXAMINATIONS – APRIL 2014
TIME: 3 Hrs.
MAXIMUM MARKS: 100
SEM
SET
PAPER CODE
TITLE OF THE PAPER
VI
2011
11UCH630304A
CORE ELECTIVE IV: ESSENTIAL OF
GENERAL CHEMISTRY
SECTION – A
Answer all the questions:
20 x 1 = 20
Choose the correct answer:
1. Heterolytic cleavage of CC leads to
a) carbanions
b) Carbocations
c) free radicals
d) both a and b
2. Reaction between carbonyl compounds with olefins under the
influence of light to form oxetanes is known as
a) Barton
b) Norish type I
c) Paterno – Buchi
d) Enamine
3. Composite material containing Ceramics and Metal
a) Cermets
b) garnets
c) thermoceramics
d) matrix
2
4.
Rotation about an axis through
angle followed by reflection in a
n
plane perpendicular to that axis
a) E
b) Sn
c) Cn
d) 
5. Photo dimerisation of anthracene causes joining of positions at
a) 2,3
b) 8,9
c) 9,10
d) 1,2
Fill in the blanks:
6.
Neighbouring group participation always resulted in _______ of
configuration.
7.
Cleavage of Cl2, 00 linkages in peroxide are the examples for
_______ reaction.
8.
Laminates and sandwich panels are examples for _______
composites.
9. Inversion through a point is termed as _______.
10. Percentage of water used in Fricke dosimeter is _______.
State True or False:
11. Ozonolysis of terminal alkenes always give methanol as one of the
products.
12. Synthons are structural units within a molecule which can be
formed by known or conceivable synthetic operation.
13. Reinforced composites are prepared by calcination process.
14. The point group symmetry of the staggered CH3 – CH3 is C3V.
15. Nitric oxide helps the photochemical combination of H2 and Cl2.
Match the following:
16. Change of polarity of carbonyl
compound
-
a) Sensitizer
18. Fibre reinforced composites
-
b) Pultrusion
c) Umpolung
19. E
20. Hg
-
d) Norrish type II
e) identity
17.  elimination of Carbonyl
compound with -H
SECTION – B
Answer all the questions:
5 x 4 = 20
21. a. Write down the products obtained when 1,3-penta diene
undergoes ozonolysis.
OR
b. Acetylene gives acetylides whereas dialkylderivative does not.
Why?
22. a. Explain the mechanism of sigmatropic rearrangement.
OR
b. Explain the mechanism of claisen rearrangement.
23. a. How are composite materials classified?
OR
b. Explain any one method of preparing fibre reinforced
composite.
24. a. List out the symmetry elements and point groups symmetry of
S8, B2H6 and [Co(en)3]3+.
OR
b. Show the symmetry element operators form a group by C2V as
an example.
25. a. Explain Chemi luminescence with examples.
OR
b. Write notes on radiolysis of water.
SECTION – C
Answer any FOUR questions:
4 x 15 = 60
26. a. Discuss the properties of aliphatic and aromatic carbonyl
compounds.
(10)
b. Explain Unpolung with an example.
(5)
27. a. Describe Jabalonski diagram.
b. Distinguish
reactions.
photochemical
(5)
reactions
from
c. Explain Barton reaction.
thermal
(5)
(5)
28. a. Discuss the components, types, products and methods of
fabrication of Ceramics and wares.
(12)
b. Write notes on glazing.
(3)
29. a. Explain the point group symmetry and elements present in
benzene, chair & boat chclo hexane.
(6)
b. State and explain the great orthogonality theorem.
(4)
c. Describe the criteria for optical activity and dipolemoment on
the basis of symmetry.
(5)
30. a. Write notes on (i) H2Cl2 photochemical reaction
(ii) Photosensitisations
b. Explain the dosimetry of Fricke dosimeter.
**************
(6)
(4)
(5)