M.Sc. (Semester III) (CBCS) Examination Oct/Nov-2017
Agrochemicals and Pest Management
ANALYSIS OF AGROCHEMICALS
Day Date: Saturday, 25-11-2017 Max. Marks: 70
Time: 02.30 PM to 05.00 PM
Instructions: All Sections are compulsory.
Figure to right indicate full marks.
Attempt any Two questions from part II.
Attempt any Two questions from part III.
Section I
Q.1 Choose the correct answer (one mark each): 14
Extent of conjugation in organic molecules can be studied by
spectroscopy.
UV IR
NMR Mass
Which of the following compound does not absorb UV radiations?
hexane Benzene
Aniline Nitrobenzene
The absorption of IR radiations by organic molecule is accompanied by
energy level change.
Electronic Nuclear spin
Vibrational None of these
of the following is IR inactive.

H3C C CH3
O
CH3 − OH
CH3 − COOH H2
IR spectroscopy gives information regarding of the organic
molecule.
Conjugation Protons
Mass Functional group
In of the following highest value is observed in PMR spectrum.
Aldehyde Carboxylic acid
Amine Ester
Ethyl acetate shows peaks in PMR spectra.
1 2
3 4
In mass spectrum the intensity assigned to base peak is
50% 100%
40%
of the following is not used as stationary phase in TLC.
Cellulose powder Silica gel
Alumina Ammonium Chloride
Page 2 of 2
SLR-E-35
10) The oxides of nitrogen are analysed by
Fluorescence Phosphorescence
Chemiluminesence All of these
11) In paper chromatography the stationary phase is always a
Solid Liquid
Gaseous All of these
12) is used as non polarized electrode in polarograhy.
Glass Platinum
Mercury pool DME
13) In Scintillation counter the Scintillations are produced on the screen coated
with.
ZnI2 ZnSo4
ZnCO3 ZnS
14) Which of the following is used as supporting electrode in polarography?
KCI solution Glucose solution
HCI solution None of these
Section II
Q.2 Write the principle and applications of HPLC in chemistry. 07
Describe double beam fluorescence spectrophotometer. 07
Q.3 Describe in detail various types of vibrations in IR spectroscopy. 07
Explain the methods used for analysis of CO and CO2. 07
Q.4 Draw and explain PMR spectra of ethanol and 2-Butanone. 07
Describe in detail G.M. Counter. 07
Section III
Q.5 Write the principle and applications of UV spectroscopy. 05
Explain metastable and isotope ions in mass spectroscopy. 05
Describe working of DME. 04
Q. 6 Distinguish following pair by IR spectroscopy. 05
CH3
C OH
O
CH3 CH2
OH
CH3
C CH3
O
CH3
C H
O
and
ii) and
Describe blue and red shift in UV spectroscopy.
Describe Mc-Lafferty rearrangement with example.
Q. 7 Write applications of PMR spectroscopy. 05
Describe types of developments in paper chromatography. 05
Write note on various types of electronic transitions in UV spectroscopy. 04