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PPSC Chemistry Part II Organic Chemistry Online Test MCQs With Answers
Question # 1
C is -2 butene on reaction with bromino give 2,3 -dibromobutane which is
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Recemic mixture
Meso isomer
Dextoroisomer
Levoisomer
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Question # 2
Which of the following factors effect the strengths of acids and bases.
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Inductive effect
Romance effect
Hydrogen effect
All above
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Question # 3
Ingold's isoprene rule states that in tepenoids isoprene units are joined.
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Head to tail
Head to Head
Tail to Tail
In a random order
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Question # 4
Orion is polymer of.
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Styrene
CF2 = CF2
Vinyl chloride
Acrylontrile
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Question # 5
Cytosine a pyrimidine base pairs with
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Guanine
Thymine
Adenine
Any of these
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Question # 6
Which of the following does not represent Lewis acid.
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ZnCl2
FeCl2
BF3
Bul4
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Question # 7
Select the major product obtained from the addition HBr to 1-methyl cyclohexene.
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1- bromo -2- methyl cyclohexane
6- bromo-1- methyl cyclohex - 1- ene
3- bromo-1- methyl cyclohex -1- ene
1- bromo-1- methyl cyclohexane
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Question # 8
Which of the following reagent cannot be used to detect the phenolic group.
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Neutral FeCl3
I2/NaOH
NaOH solution
Br2/H2O
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Question # 9
Bromination of n-butane produces.
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I-bromobutane as the major product
2- bromobutane as the major product
Both I - bromo and 2- bromobutane with equal percentage
Both i-bromo and 2-bromo products whose percentage depends upon temperature.
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Question # 10
In order to give strength and elasticity natural rubber is heated with.
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Sulphur
Oxygen
Nitrogen
Chlorine
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Question # 11
If the activation energy in the forwarded direction of an elementary step is 52 kj and the activation energy in the reverse direction is 74 kj. What is the energy of reaction Delta E for this step
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22 Kj
-22 kj
52 kj
-52 kj
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Question # 12
The study of coiled long peptide chains of protein to give a 3 dimensional structure is the study of.
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Primary structure
Secondary structure.
Tertiary structure
Quaternary structure.
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Question # 13
Which of the following polymers is chlorinated.
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Orlon
Neoprene
Dacron
None of these
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Question # 14
Which of the following is capable of shown g optical isomersm.
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CH3COCOOH
CH3CHOHCOOH
Botha a and b
All of these
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Question # 15
Which statement is true.
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Resonance hybride are inherently unstable.
Resonance hybride are more static than any individual resonance form
Resonance hybride are average of all resoance forms resembling the more stabel forms
None of the above
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Question # 16
The dye which is a constituent of Skiffs reagent used for detection formaldehyde group is.
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Gentain violet
Megneta
Phenolphthalein
Rosolic acid
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Question # 17
Hydrolysis of protein gives
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a -amino acid only
b-amino acids only
gama amino acid only
A mixture of all of these
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Question # 18
The IUPAC name of C2(CN)3 is
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2,3-dicvano butanedinitrile
2,3 -dicyano -2- butenedinitrile
1,1,2,2-tetrcyanoethane
1,1,2,2, tetracyanocthenc
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Question # 19
An example of acyclic polytropenoid is
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Myrcone
Buna -S
Synthetic rubber
Natural rubber
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Question # 20
Proteins have characteristics
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Melting poirn t
Iso electric point
Boiling point
All of these
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Question # 21
Inorganic acids (HCl, HBr, HNO3 etc) have K value.
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< 1
>1
>10
<10
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