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PPSC Chemistry Part II Organic Chemistry Online Test MCQs With Answers
Question # 1
Which type of polymers the Vulcanised rubbers is.
Choose an answer
Linear
Cross jinked
Branch chain
Any one of these
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Question # 2
Select a basic amino acid.
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Glycine
Cystine
Alanine
Lysine
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Question # 3
Carbylamine reaction proceeds via the intermediate formation of.
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Alkyl isocyanide
Chloride ion
Alkyl carbonion
Dichloro methylene
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Question # 4
Arrangement of peptide chains of protein in spec to form helix stucture is referred to as.
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Primary structure
Secondary structure
Tertiary structure
Quaternary structure
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Question # 5
A terpenoid which as an alcoholic group in the molecule is
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Citral
Camphor
Menthol
Carvone
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Question # 6
Phosphorus is detected by fusing the organic compound with -------followed by extraction with H2O
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HNO3
H2SO4
Sodium per oxide
Ozone
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Question # 7
a-pinene hydrochloride on warming rearrangements to form bornyl chloride
Choose an answer
Pinacol pinacolone
hofmann
Wagner Meerwein
Wolf
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Question # 8
The compound (CH3)3COH according to IUPAC is known as.
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Tert Butanol
2,2 -Dumethyl -Propanol
2- Methyl -2-propanol
Tert Alcohol
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Question # 9
Which one of the following woul dmake an S
N
2 mechanism more likely
Choose an answer
Bulky substituents near the halogen
A polar solvent
A tertiary carbocation intermediate
A reactive nucleophile
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Question # 10
Select the major product obtained from the addition HBr to 1-methyl cyclohexene.
Choose an answer
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 # 11
Enfleurage process is ued to extract the essential oils from
Choose an answer
Bark of plant
Seeds of plant
Leaves of plant
Flowers of plant
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Question # 12
Which statement is false.
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If a reaction is thermodynamically spontaneous it may occur rapidly
If a reaction is thermodynamically spontaneous it may occur slowly.
Activation energy is a kinetic quantity rather than a thermodynamic quantity.
If a reaction is thermodynamics spontaneous, it must have a low activation energy.
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Question # 13
Sugar and common salt in a mixture can be separated through then process of.
Choose an answer
Sublimation
Distillation
Ion exchange
Crystallization from solution in ethanol
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Question # 14
Which of the following statements regarding phenols is not correct.
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Phenol ls are stronger acids than water and alcohols.
Phenol are weaker acids than carboxylic acids
Phenol are solubel in both aqueous NaOH and aqueous sodium hydrogen carbonate
Phenoxides ions are more stable than the corresponding phenol
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Question # 15
Urea an enzyme used to estimate urea is a
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Hydrolytic enzyme
Oxidative enzyme
Reductive enzyme
Iso me rising enzyme
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Question # 16
The reduction of an alkyne to alkene using Lindlar's catalyst results into
Choose an answer
Syn addition of hydrogen atoms
Anti addition of hydrogen atoms
A mixture obtained by ayn and anti addition of hydrogen which are equilibrium with each other
A mixture obtained by syn and anti addition of hydrogen which are not in equilibrium with each other.
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Question # 17
The light absorbed in UV and visible region causes.
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Vibrational energy changes
Rotational energy changes
Electronic excitation
All of these
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Question # 18
Suppose the activatin energy of a certain reaction is 250 kj/mol, If the rate constant at T1 =300 K is k1 and the rate constant at T2= 320 K is ks, then the reaction is ______ times faster at 320 K than at 300 K
Choose an answer
3 x 10
-29
0.067
525
15.0
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Question # 19
How many stereoisomers are possible for CH3CH = CHCHCH(Br) CH3
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2- geometrical isomers
2- optical isomers
2- geometricla nad 2- optical isomers
2- geometrical and 1 optical isomers
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Question # 20
The electrophile in the sulphonation of benzene is.
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SO3
SO3H
HSO4
SO2
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Question # 21
All bond length in benzene are identical due to.
Choose an answer
Resonance effect
Inductomeric effect
Electromeric effect
Mesomeric effect
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