M.Sc. (Semester (CBCS) Examination Mar/Apr-2018
Agrochemicals And Pest Management
CHEMISTRY OF PESTICIDES AND THEIR FORMULATIONS I
Time: 2½ Hours
Max. Marks: 70
Instructions: All sections are compulsory. Figures to the right indicate full marks. Attempt any two questions from section-II and Section-III All questions carry equal marks.
Section I
Q.1
Select most correct alternative of the following. (Each carry 1 marks)
14
In Benzoin condensation, benzaldehyde undergoes self condensation in the presence of
Sodium ethoxide
Sodium hypobromite
Sodium hydroxide
Sodium cyanide
Alkylation of benzene is carried out with alkyl halide in presence of
AlCl3
ZnCl2
FeCl3
CdCl2
In Cannizarro reaction two molecules of aldehyde in presence of conc. alkali undergoes
Addition reaction
Oxidation and reduction
Both undergoes oxidation
Both undergoes reduction
SN2 reaction example of reaction.
Electrophilic substitution
Nucleophilic substitution
Electrophilic addition
Electrophilic substitution
Which of the following pesticide is formulated in the form of dust
Sulphur
Diazinon
Acetamide
Dimethyl benzamide
Chemically natural pyrethroids are
Acids
Alcohols
Esters
Amides
Neem extract contains active ingredient
Terpenoid
Limonoid
Alkaloid
None of these
Which of the following is correct structure of Diazinon?
C2H5OOSC2H5ONNCH(CH3)2CH3C2H5OOOC2H5OCH3CH(CH3)2C2H5OOSC2H5OCH(CH3)2NC2H5OOSC2H5ON(CH3)2Na)Pb) Pc) PPd)
Which of the following compound is not fumigant?
CH3Br
HCN
PCNB
CH3CI
10) Which of the following is not synthetic pyrethroid?
Jasmolin
Cypermethrin
Deltamethrin
Allethrin
11) Perkin's reaction is carried out at temperature.
200oc
190oc
150oc
180oc
12) Rogar is trade name of
Dimethoate
Thiamate
Phorate
Malathion
13) Pyridine ring system is presented in
Quinalphos
Monocrotophos
Chlorpyriphos
Phorate
14) N N dimenthyl benzamide is used as
Pesticide
Insect repellant
Fungi cide
Insect attractant
Section II
Attempt any two questions from this section:-
Q.2
Complete the following reaction and suggest the mechanism. Name the reaction.
07
CHOH2CCOC2H5COC2H5OO+Pyridine?
Describe the following pesticide formulations.
1. Baits and Lures
2. Smoke and Dusts
07
Q.3
Give synthesis of Quinalphos and Malathion.
07
Describe the use of Neem plant extract in pest control.
07
Q.4
Discuss Benzoin condensation reaction with mechanism.
07
Give synthesis and uses of Permetherin and Deltametherin.
07
Section III
Attempt any two questions from this section:-
Q.5
Discuss SN2 reaction with mechanism. Give energy profile diagram.
05
Give synthesis and uses of moncrotophos.
05
Describe the formulation of emulsions.
04
Q.6
Give synthesis and uses of chloropyriphos.
05
Describe the recently used insect attractants and repellants.
05
Discuss E1 elimination with mechanism.
04
Q.7
What is Pinacol? Discuss Pinacol-Pinacolone rearrangement reaction with mechanism.
05
What are pest and pesticides? Give their classification.
05
Write note on non-toxic insect controlling agents.
04