Alkenes(Geometrical Isomerism: Mechanism of Electrophilic Addition: Addition of Hydrogen, Halogens,... ) NEET Questions

Organic Chemistry - Hydrocarbons

Alkenes(Geometrical Isomerism: Mechanism of Electrophilic Addition: Addition of Hydrogen, Halogens,... ) MCQ Questions


7.
Polymerization of ethene yields:
A.
Polyester
B.
Polypropene
C.
Polystyrene
D.
Polyethene
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ANSWER :
D. Polyethene
8.
Which of the following reactions is an example of electrophilic addition?
A.
Halogenation of alkene
B.
Combustion of alkene
C.
Cracking of alkene
D.
None of these
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ANSWER :
A. Halogenation of alkene
9.
Addition of Brâ‚‚ to ethene gives:
A.
1,1-dibromoethane
B.
1,2-dibromoethane
C.
Ethane
D.
Ethanal
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ANSWER :
B. 1,2-dibromoethane
10.
Which intermediate is formed during the addition of HBr to alkenes?
A.
Carbocation
B.
Carbanion
C.
Radical
D.
None of these
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ANSWER :
A. Carbocation
11.
Geometrical isomerism is due to:
A.
Free rotation around sigma bond
B.
Restricted rotation around double bond
C.
Torsional strain
D.
Steric hindrance
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ANSWER :
B. Restricted rotation around double bond
12.
Which of the following alkenes has both cis and trans isomers?
A.
Propene
B.
2-butene
C.
2-methylpropene
D.
1-butene
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ANSWER :
B. 2-butene