Chemistrykey Question Preview (ID: 51960)


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In alkenes, the carbon atoms are connected to each other by a
a) Single bond
b) Double bond
c) Triple bond
d) Not connected

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

Which among these is not a structural isomer of the compound C4H8
a) 2-methylpropene
b) But-1-ene
c) But-2-ene
d) But-3-ene

Select the incorrect statement regarding alkenes
a) Alkenes are less reactive than alkanes
b) In alkenes, the carbons are connected by pi bonds
c) Alkenes have almost same physical properties as that of the alkanes
d) Alkenes undergo polymerization reaction

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

Ethene on reaction with bromine forms which among the following product?
a) BrH2C=CH2Br
b) Br2HC=CHBr2
c) Br2HC-CHBr2
d) BrH2C-CH2Br

Which among these is not the types of reactions of alkenes?
a) Addition reaction
b) Electrophilic additional reaction
c) Elimination reaction
d) Oxidation of alkenes

Which of the following products is/are formed when HBr reacts with pent-2-ene?
a) CH3CHBrCH2CH2CH3 and CH2BrCH2CH2CH2CH3
b) CH3CHBrCH2CH2CH3 only
c) CH3CHBrCHBrCH2CH3 only
d) CH3CHBrCH2CH2CH3 and CH3CH2CHBrCH2CH3

The compound formed when bromine reacts with but-1-ene is
a) 1-bromobutane
b) 1,2-dibromobutane
c) 2-bromobutane
d) 1,3-dibromobutane

Which one of the following isomers of molecular formula C4H8can exist in two forms
a) But-2-ene
b) But-1-ene
c) 2-methylpropene
d) Cyclobutane

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