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WorksheetsAlkenes
Total questions: 20
Worksheet time: 2hrs 40mins
What is the major product of the reaction between but-1-ene and DBr? (D is deuterium and represents 2H)
CH2DCH2CH2CH2Br
CH2DCH2CHBrCH3
CH3CH2CHBrCH2D
CH3CH2CHDCH2Br
In which of the following is a curly arrow used incorrectly?
A
B
C
D
The structure of the molecule of methyl 2-methylpropenoate is shown below. Which one of the following statements concerning this compound is not true?
It displays geometrical isomerism.
It forms an addition polymer.
It undergoes reduction.
It decolourises bromine.
The correct systematic name for the molecule shown is ...
2-ethyl-3,4-dimethylpent-2-ene
4-ethyl-2,3-dimethylpent-3-ene
2,3,4-trirnethylhex-3-ene
3,4,5-trimethylhex-3-ene
The repeating unit of a polymer is shown above. Which of the following molecules would form a polymer containing this repeating unit?
But-1-ene
E-but-2-ene
Z-but-2-ene
Methylpropene
The correct name for the alkene monomer which forms the polymer shown above is
2-methyl-3-ethylpropene
2-methylpent-2-ene
2-methylpent-3-ene
4-methylpent-2-ene
Which one of the following mechanisms is not involved in the reaction sequence below?
CH3CH3 → CH3CH2Cl → CH3CH2OH → CH2=CH2 → CH3CH2Br
electrophilic addition
electrophilic substitution
nucleophilic substitution
free-radical substitution
Which is the major product of the reaction between 2-methylbut-2-ene and iodine monochloride (ICl)?
A
B
C
D
Which statement about ethene is correct?
It has no geometric isomers because there is free rotation around the C=C bond.
It reacts with HBr in a nucleophilic addition reaction.
It burns in excess oxygen to produce carbon dioxide and water.
The C=C bond is twice as strong as the C–C bond in ethane.
Which statement is correct about poly(chloroethene)?
It has the empirical formula CHCl
It decolourises bromine water.
Its brittleness is reduced by plasticisers.
Its polymer chain contains alternate single and double bonds.
What is the empirical formula of 4-hydroxypent-2-ene?
C5H12O
C5H10O
CH2O
C5H9OH
Which statement about E-1,2-dichloroethene is NOT correct?
It has the same boiling point as Z-1,2-dichloroethene.
It forms a polymer with the same repeating unit
as Z-1,2-dichloroethene.
It has the same IR spectrum as Z-1,2-dichloroethene
in the range 400–1500 cm−1.
It has a molecular ion peak different from that of
Z-1,2-dichloroethene in its mass spectrum.
Which of the following mechanisms does not occur in reactions of bromoethane?
Electrophilic addition
Elimination
Nucleophilic substitution
Radical substitution
Pentanenitrile can be made by reaction of 1-bromobutane with potassium cyanide.
Which of these is the correct name for the mechanism of this reaction?
Electrophilic addition
Electrophilic substitution
Nucleophilic addition
Nucleophilic substitution
How many different alkenes are formed when 2-bromo-2-methylbutane reacts with ethanolic potassium hydroxide?
2
3
4
5
Which one of the following statements explains best why fluoroalkanes are the least reactive haloalkanes?
Fluorine is much more electronegative than carbon.
The F− ion is the most stable halide ion.
The C–F bond is the most polar carbon–halogen bond.
The C–F bond is the strongest carbon–halogen bond.
This question is about a method that can be used to prepare ethylamine.
CH3CH2Br + 2NH3 = CH3CH2NH2 + NH4Br
Which statement about the reaction is not correct?
Ethylamine is a primary amine.
The mechanism is a nucleophilic substitution.
Using an excess of bromoethane will prevent further reaction to form a mixture of amine products.
Ammonium bromide is an ionic compound.
Tetradecane (C14H30) is an alkane found in crude oil. When tetradecane is heated to a high temperature, one molecule of tetradecane decomposes to form one molecule of hexane and three more molecules.
Which of the following could represent this reaction?
C14H30 → C6H14 + C4H8 + 2C2H4
C14H30 → C6H14 + C6H12 + C2H4
C14H30 → C5H12 + 3C3H6
C14H30 → C6H14 + C2H6 + 2C3H6
Which molecule is not produced when ethane reacts with bromine in the presence of ultraviolet light?
C2H4Br2
HBr
H2
C4H10
Which correctly represents an incomplete combustion of pentane?
C5H12 + 8O2 ⟶ 5CO2 + 6H2O
C5H12 + 8O2 ⟶ 4CO + CO2 + 6H2O
C5H12 + 6O2 ⟶ 4CO + CO2 + 6H2O
C5H12 + 5O2 ⟶ 4CO + CO2 + 4H2O + 2H2
