Organic Chemistry Multiple Choice Questions and Answers – Alkenes

Questions
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

Answer: Double bond
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

Answer: But-3-ene
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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

Answer: Mercuration
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

Answer: Ethene
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

Answer: 1,3-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

Answer: 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

Answer: BrH2C-CH2Br

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