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PPSC Chemistry Part II Organic Chemistry Online Test MCQs With Answers
Question # 1
Each of the following compound is an aromatic except.
Choose an answer
Benzene
Naphthalene
Cyclopentadienyl cation
Cyclopentadienyl anion
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Question # 2
In Dumas method, the volume of the gas collected is equivalent to which of the following gases set free from the compound.
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Ammonia
O2
N2
NO
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Question # 3
Which of the following statement is not correct n respect of Arrhenius concept.
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The concept is applicable only for aqueous systems.
Neutralization takes place in aqueous mediam only
TH+ ion cannot remain as such in water
This concept is applicable for non aqueous system only.
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Question # 4
Enzymes are
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Complex non living compunds
Laving organisms
Complex protein molecules
Bacterial colonies
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Question # 5
An auxochrome is a group which
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Absorbs in UV region
Absorbs in visible region
Absorbs in IR region
Increase absorption wavelength of chromophore
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Question # 6
The reason why phenylamine is a much weaker base tahn ammonia when each is in aqueous solution to that.
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Teh ion pair of electron on two nitrogen atom of phenylamine is delocalised over the benzene ring.
The phenylamine molecule is too large to capture hydrogen ion easily
Phenylamine is much less soluble is water than is ammonia
The benzene ring has a tendency to increase the acidity of its substituents.
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Question # 7
Vitamin which contains cobalt is.
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Vitamin B1
Vitamin B2
Vitamin B6
Vitamin B12
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Question # 8
It is possible to distinguish between optical isomers.
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Using chemical tests
By mass spectrometry
By IR spectroscopy
By polarimetry
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Question # 9
Primary structure of protein refers to
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Amino acid sequence
Arrangement of peptide chains
Orientation of amino acids
Whether is has a or b helix in space structure.
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Question # 10
In the reaction RCO2Na + Na OH (CaO) ______ RH, we eliminate carboxylate group as.
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CO2
Na2CO3
-CO
CaCO3
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Question # 11
The dye obtained from madder root
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Indogotin
Indanthrene
Alizarin
Acriflavin
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Question # 12
The unit of nucleic acid having base sugar combination is called.
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Nucliec acid
Nucleoside
Nucleotide
None of these
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Question # 13
Lactic acid is a molecule which shows
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Epimersim
Tautomerism
Opical isomerism
Metamerism
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Question # 14
If reaction A has an activation energy of 250 kj and reaction activation energy of 100 kj, which of the following statements must be correct.
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If reaction A is exothermic and reaction B is endothermic then reaction A is favored kinetically
At the same temperature the rate of reaction B is greater than the rate of reaction A
The energy of reaction A must be greater than the energy of reaction B.
The energy of reaction B must be greater than the energy of reaction A
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Question # 15
Which of the following effects best explains that o-nitro phenol is insoluble in water.
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Inductive effect
Resonance effect
Intramolecular H -bonding
Isomeric effect
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Question # 16
Which of the following equations represent linear free energy relationship.
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Hammett equation
Taft equation
Helmholtz equation
Differential equation
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Question # 17
Which of the following type of polymerization is used for the preparation of synthetic rubber.
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Free radical
Zingler natta
Cationic
Anionic
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Question # 18
The most stable carbonium ion is
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See butyl
n-butyl
Tert butyl
None of the above
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Question # 19
Eosin dye belongs to the group of dyes known as.
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Nitroso syes
Triphenylmethane dyes
Diphenylmethane dyes
Phthalein dyes
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Question # 20
When the colourless liquid chlorobenzene is shaken with bromine water, the chlorobenzen becomes a yellow-orange colour. Which of the following is the best interpretation of this.
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An addition compound of chlorobenzene and bromine has been formed.
The chlorine atom has been replaced by a bromine atom
The bromine is mor esoluble in chlorobenzene than in water
A hydrogen atom has been replaced by a bromine atom
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Question # 21
The bond length of C = C is
Choose an answer
1.20 A
o
1.34 A
o
1.54 A
o
1.68 A
o
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