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Online Tests
PPSC Chemistry Part II Organic Chemistry Online Test MCQs With Answers
Question # 1
Which of the following factors effect the strengths of acids and bases.
Choose an answer
Inductive effect
Romance effect
Hydrogen effect
All above
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Question # 2
Hydrogen bons holding the strand to nucleic acids are formed between
Choose an answer
Sugar and base units
Base unit
Sugar ane phosphate units
Sugar units
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Question # 3
Which of the following alkyl halide undergoes nucleophilic substitution reaction via the formation of a carboncation.
Choose an answer
1-chloro -2 methyl propane
2- chlro-2-methyl propane
2- chloro butane
1-Chloro, 3,3- dimethyl pentane
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Question # 4
Which of the following statement in not correct with respect to inductive effect.
Choose an answer
Bond length decrease with increase in inductive effect.
Inductive effect generates polar character in bonds
Variation in strength of aliphatic acids can be explained
It alone cna explain the basically of triphenylamine
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Question # 5
Which of the following is branch chain polymer.
Choose an answer
Glycogen
Terylene
PVC
Orlen
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Question # 6
The dye which is a constituent of Skiffs reagent used for detection formaldehyde group is.
Choose an answer
Gentain violet
Megneta
Phenolphthalein
Rosolic acid
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Question # 7
Dyes used in photographic plates to make them panchromatic is.
Choose an answer
Cyanine dyes
Azine dyes
Phthalocyanine dyes
Acridine dyes
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Question # 8
Phosphorus is detected by fusing the organic compound with -------followed by extraction with H2O
Choose an answer
HNO3
H2SO4
Sodium per oxide
Ozone
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Question # 9
Orion is polymer of.
Choose an answer
Styrene
CF2 = CF2
Vinyl chloride
Acrylontrile
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Question # 10
Select an acidic amino acid
Choose an answer
Lysine
Cystine
Aspartic acid
Aminoacetic acid
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Question # 11
Which of the following case of acid or base strength is not explained by inductive effect.
Choose an answer
Formic acid> acetic acid
Dimethyl amine > trimethyl amine
Dimethyl amine > methyl amine
Chloroacetic acid > acetic acid
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Question # 12
Each of the following compound react with Grignard's reagent to form alkane exxcept.
Choose an answer
Ethanal
Ethanoic acid
Ethanol
Ethync
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Question # 13
The decomposition of dimethyl ether at 504 oC is first order with a half -life of 1570 second. What fraction of an initial amount of dimethyl ether remain after 47-10 seconds.
Choose an answer
1/3
1/6
1/8
1/16
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Question # 14
Process of separating the racemic mixture into optically active isomers is known as.
Choose an answer
Resolution
Racemisation
Walden inversion
Epimerization
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Question # 15
Monomer of natural rubber is
Choose an answer
1,3-Butadiene
2-Methyl -1,3-butadiene
1,2 -Butadiene
1,3 - Pentadiene
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Question # 16
Treatment of phenol with cold dilute nitric acid gives.
Choose an answer
Only o-nitro phenol
Only p-nitro phenol
2,4,6 -Teinitro phenol
Mixture of o-and p-nitro phenol
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Question # 17
A correct reaction mechanism for a given reaction usually is.
Choose an answer
The same as the balanced chemical equation
Obvious if its heat of reaction is known
Sometimes difficult to prove
Obvious if the activation energy is known
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Question # 18
Which of the following is capable of shown g optical isomersm.
Choose an answer
CH3COCOOH
CH3CHOHCOOH
Botha a and b
All of these
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Question # 19
The IUPAC name of ethylene oxide is.
Choose an answer
Epoxy methane
Oxcethene
Methoxymethane
All of the above
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Question # 20
a- pinene hydrochloride on warming rdarranges to form bornyl chloride.The rearrangement is known as.
Choose an answer
Pinacol pinacolone
Hofinann
Wager Mecrwein
Wolff
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Question # 21
Alkyl cyanide and alkyl isocyanides are
Choose an answer
Tautomers
Metamers
Functional isomers
None of the above
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