Master of Science I (Agrochemical and Pest Management)
Examination: Oct Nov 2016 Semester I (Old CBCS)
SLR No. Day
Date Time Subject Name Paper No. Seat No.
SLR SP
06
Wednesday
16/11/2016
10.30 AM
to
01.00 PM
Chemistry of Pesticides and
Their Formulation I
C
I
Instructions: All questions carry equal marks.
All Sections are compulsory.
Attempt any two questions from Section II and III
Figures to the right indicates full marks
Total Marks:70
SECTION I
Q.1 Select most correct alternative from the following (each carry 1 marks) 14
Natural pyretaroids cannot be used in field because of
Toxicity High Cost
Poor stability Low activity
ii) Chemical nature of pyretaroids are
Esters Acids
Alcohols Amides
iii) Sulphur is formulated in the form of
Aerosol Emulsive concentrate
Solution Dust
iv) Reimer Tiemann reaction is useful for the preparation of
Benzaldehyde Salicyaldehyde
Anisole Acetophenone
What is the product of following reaction
Salicylic acid Benzoic acid
Cinnamic acid Phthalic acid
vi) Benzene on treatment CH3COCl and AlCl3 with and gives Acetophenone this
reaction is known as
Fridel Craft's acylation Fridel Craft's alkylation
Sulphonation Halogenation
vii) SN1 reaction is example of
Nuclophilic addition Electrophilic addition
Nucleophic substitution Electrophilic substitution
viii) The neem extract is used to control of
Nematodes Mosquitoes
Insects All the above
ix) Neem extract contains main active ingredient is
Terpentoid Limonoid
Alkaloid None of these
The reaction between dimethlydithiophophoric acid and N-methyl
chloroacetamide gives
Malethion Phosphamidon
Diazison Dimethoate
xi) Dimecron is trade name of
Phosphamidon Quinolphos
Phorate Sehradon
xii) Quinoxaline ring system is present in
Chloropyriphos Monocrotophos
Quinolphos Phorate
xiii) Name the following pesticide
Parathion Diazinon
Malethion Phosphomidon
xiv) CH3Br is used as
Fumigant Insect attractant
Rodenticide Pesticide
SECTION II
Attempt any two questions from this section.
Q.2 Discuss cannizarro's reaction with mechanism. 07
Give synthesis and uses of Malathion and Dimethoate. 07
Q.3 Discuss Perkin's reaction with mechanism. 07
Describe the following pesticide formulates.
i. Dusts
ii. Aerosols
07
Q.4 Give synthesis and reactions of Permethrin and Deltamethrin. 07
Give synthesis and uses of Phorate and Quinolphos. 07
SECTION III
Attempt any two questions from this section.
Q.5 Discuss SN1 reaction with mechanism and energy profile diagram. 05
Discuss pyrethrins and their synthetic analogues. 05
Discuss the uses of insect attractants and repellents. 04
Q.6 Discuss Reimer Tiemann reaction with mechanism. 05
Discuss how Neem extract is useful for plant protection. 05
Give synthesis and uses of Monocrotophos. 04
Q.7 Discuss Wagner Meerwein rearrangement reaction with mechanism. 05
Discuss different methods used for extraction of Neem plant. 05
Write note on Natural and synthetic Pyrathroids. 04