M.Sc. (Semester II) (CBCS) Examination Nov/Dec-2018
Agrochemicals and Pest Management
CHEMISTRY OF PESTICIDES AND THEIR FORMULATIONS II
Time: 2½ Hours Max. Marks: 70
Instructions: All sections are compulsory.
All questions carry equal marks.
Attempt any two questions from section-II and III
Figures to the right indicate full marks.
SECTION I
Q.1 Rewrite the sentences by choosing correct answer from given alternatives: 14
Name the following pesticide.
Cl
Cl
O CH2 COOH
I I A DDVD
4-D PCNB
Mercaptans and sulphides are used as
Herbicides Fungicides
Acaricides Bactericides
Methiuron is derivative of
Urea Dimethyl urea
Thiourea Thiocyanate
Reaction between ethylene diamine, carbon disulphide and sodium hydroxide
with zink sulphate gives:-
Zineb Maneb
Ziram Aldicarb
Bordeaux mixture is the mixture of
CuSO4 Cu CuSO4 ZnSO4
CuSO4 MgSO4 CuSO4 Ca
Thiocyanate exhibit their pesticidal activity due to release of
Hydrogen sulphide Hydrogen cyanide
Ammonia Carbondioxide
Pentachlorobenzene on nitration with Con HNO3 Con H2SO4 gives
Penta chloro nitro benzene Hexachloro benzene
Amino benzene Benzene
Page 2 of 3
SLR-VA-6
Name of the following pesticide:-
C
N
H5C2
O2N NO2
C4H9
F F
F
Nitralin Trifluralin
Benifin Bulbasan
Chlorobenside is obtained by reaction between P-chlorothiophenotate with
P Chlorobenzyl chloride P Chloronitro benzene
O dichlorobenzene 2:4 dichlorobenzyl chloride
10) BHC is less toxic due to
High persistence Less persistence
LD-50 value is high LD-50 value is less
11) Baygon is produced by reacting 2 isopropyl phenol with
Methyl bromide Methyl nitrite
Phenyl isocyanate Methyl isocyanate
12) Endosulphan is also called as
Thiodan Sevin
Chloral Azadrin
13) Alkyl ester of N-aryl carbamic acid are used as powerful
Insecticide Weedicide
Pesticide Herbicide
14) Which of the following compound is used as rodenticide
Zinc carbonate Zinc chloride
Zinc phosphate Zinc Sulphate
SECTION II
Attempt any two questions from this section
Q.2 Answer the following any four:-
What are carbamates? Give synthesis of carbaryl and Baygon.
What is rodenticide? Describe in detail zinc ad thallium sat as rodenticide.
07
07
Q.3 Give methods of preparations of Zineb and Ziram.
Describe the role of phenolic compounds as pesticides.
07
07
Q.4 Give synthesis of Benifin and Nitralin.
Describe the pesticides belonging to class thiourea.
07
07
SECTION III
Attempt any two questions from this section
Q.5 Give synthesis of 2,4 D. 05
Explain the role of copper compounds as pesticides. 05
Use of computer in the pesticide formulations. 04
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SLR-VA-6
Q.6 Give synthesis of captan. 05
Give synthesis and uses of Trifluralin. 05
Describe the role of arsenic compounds as pesticides. 04
Q.7 Give synthesis of Carbofuran. 05
Give synthesis and uses of Tenuron. 05
Give synthesis and uses Endosulphan.