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Free download in PDF Organic Chemistry Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like UPSC, NDA, SSC etc. These short solved questions or quizzes are provided by Gkseries./p>
(1)
In Alkenes the Carbon atoms are connected to each other by a ___________
[A]
Single bond
[B]
Double bond
[C]
Triple bond
[D]
Not connected
(2)
Which among these is not a structural isomer of the compound C4H8?
[A]
But-1-ene
[B]
But-2-ene
[C]
But-3-ene
[D]
2-methylpropene
(3)
Select the incorrect statement regarding alkenes.
[A]
In alkenes, the carbons are connected by pi bonds
[B]
Alkenes have almost same physical properties as that of the alkanes
[C]
Alkenes are less reactive than alkanes
[D]
Alkenes undergo polymerization reaction
Answer: Alkenes are less reactive than alkanes
(4)
Identify the addition reaction which is not undergone by the alkenes?
[A]
Mercuration
[B]
Oxymercuration
[C]
Hydroboration
[D]
Halogenation
(5)
Identify the incorrect statement regarding the synthesis of alkenes.
[A]
Cracking of a hydrocarbon yields alkenes
[B]
The reactions are exothermic
[C]
Zeolite catalyst helps in the synthesis of alkenes
[D]
The synthesis of alkenes is otherwise known as reforming
Answer: The reactions are exothermic
(6)
Identify the one which shows E-Z mechanism?
[A]
3-methylpent-2-ene
[B]
2-methylpent-2-ene
[C]
Methyl-3-pent-2-ene
[D]
2,3-methylpentene
Answer: 3-methylpent-2-ene
(7)
Which among the following is not colourless?
[A]
Methene
[B]
Ethene
[C]
Propene
[D]
Butene
(8)
Which among the following alkenes is used in the manufacturing of plastics?
[A]
Butadiene
[B]
1,2-butadiene
[C]
1,3-butadiene
[D]
2-butadiene
(9)
4-chlorobut-1-ene is the name of which among the following alkenes?
[A]
CH2Cl-CH2=CH-CH2
[B]
CH2Cl-CH2-CH-CH2
[C]
CH2Cl=CH2-CH=CH2
[D]
CH2Cl-CH2-CH=CH2
(10)
Ethylene on reaction with bromine forms which among the following product?
[A]
BrH2C-CH2Br
[B]
BrH2C=CH2Br
[C]
Br2HC=CHBr2
[D]
Br2HC-CHBr2
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