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- 1. Multiple Choice
The correct systematic name for molecule in the image is ...
2-ethyl-3,4-dimethylpent-2-ene
4-ethyl-2,3-dimethylpent-3-ene
2,3,4-trimethylhex-3-ene
3,4,5-trimethylhex-3-ene
- 2. Multiple Choice
CH2O is the empirical formula of
methanol
methyl methanoate
ethane-1,2-diol
butanal
- 3. Multiple Choice
Z-Retinal, shown in the diagram, is a component in vitamin A. Which of the double bonds, labelled A, B, C or D, is responsible for the letter Z in the name?
A
B
C
D
- 4. Multiple Choice
The correct name for the alkene monomer which forms the polymer shown below is ...
2-methyl-3-ethylpropene
2-methylpent-2-ene
2-methylpent-3-ene
4-methylpent-2-ene
- 5. Multiple Choice
The structure of cyclohexene is shown. Which of the following is the general formula of cyclic alkenes such as cyclohexene?
CnH2n–4
CnH2n–2
CnH2n
CnH2n+2
- 6. Multiple Choice
Which of the arrows, labelled A, B, C or D in the mechanism in the diagram, is not correct?
A
B
C
D
- 7. Multiple Choice
Which compound does not show stereoisomerism?
1,2-dichloropropene
1,2-dichloropropane
1,3-dichloropropene
1,3-dichloropropane
- 8. Multiple Choice
Which equation is a propagation step in the conversion of trichloromethane into tetrachloromethane by reaction with chlorine in the presence of ultraviolet light?
CHCl3 + Cl2 ⟶ CCl4 + HCl
●CCl3 + ●Cl ⟶ CCl4
CHCl3 + ●Cl ⟶ CCl4 + ●H
●CCl3 + Cl2 ⟶ CCl4 + ●Cl
- 9. Multiple Choice
How many structural isomers are there with the molecular formula C3H6BrCl?
4
5
6
7
- 10. Multiple Choice
Which of the following is a correct mechanism for the formation of 2-methylbut-2-ene
from 2-bromo-3-methylbutane?
A
B
C
D
- 11. Multiple Choice
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
- 12. Multiple Choice
An alkane contains 30 hydrogen atoms per molecule. Its empirical formula is
C6H15
C7H15
C14H30
C15H30
- 13. Multiple Choice
The percentage by mass of carbon is 83.3% in
propane
butane
pentane
hexane
- 14. Multiple Choice
Which one of the following is least likely to occur in the reaction between methane and chlorine?
CH4 + Cl• → CH3• + HCl
CH3• + HCl → CH3Cl + H•
CH3• + Cl2 → CH3Cl + Cl•
CH3Cl + Cl• → CH2Cl• + HCl
- 15. Multiple Choice
Which statement is correct about the fractional distillation of crude oil?
A zeolite catalyst is used.
Each fraction contains a mixture of hydrocarbons.
Gaseous fractions are formed by breaking covalent bonds.
The fractionating column is hottest at the top.
- 16. Multiple Choice
Sulfur dioxide (SO2) is produced when some fossil fuels are burned. Which of the following statements is true?
Sulfur dioxide can be removed from waste gases in a power station by an acid-base reaction with calcium oxide.
Sulfur dioxide is insoluble in water.
Sulfur dioxide is a basic oxide.
Sulfur dioxide is an ionic compound.
- 17. Multiple Choice
Which molecule is not produced when ethane reacts with bromine in the presence of ultraviolet light?
C2H4Br2
HBr
H2
C4H10
- 18. Multiple Choice
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
- 19. Multiple Choice
Which of these substances does not contribute to the greenhouse effect?
Unburned hydrocarbons
Carbon dioxide
Water vapour
Nitrogen
- 20. Multiple Choice
Which catalyst is used in the catalytic cracking of alkanes?
Concentrated phosphoric acid
Iron
Nickel
Zeolite
- 21. Multiple Choice
The table shows possible conditions and products for the cracking of alkanes. Which row is correct?
A
B
C
D
- 22. Multiple Choice
Which species could act as a nucleophile?
BH3
NH4+
PH3
SiH4
- 23. Multiple Choice
This question is about a method that can be used to prepare ethylamine. Which statement about the reaction is not correct?
CH3CH2Br + 2NH3 CH3CH2NH2 + NH4Br
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.
- 24. Multiple Choice
How many different alkenes are formed when 2-bromo-3-methylbutane reacts with ethanolic potassium hydroxide?
2
3
4
5
- 25. Multiple Choice
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.
- 26. Multiple Choice
Why are fluoroalkanes unreactive?
Fluorine is highly electronegative.
The F– ion is very stable.
They are polar molecules.
The C–F bond is very strong.
- 27. Multiple Choice
Which compound has the fastest rate of reaction with potassium cyanide to form pentanenitrile?
1-bromobutane
1-chlorobutane
1-fluorobutane
1-iodobutane
- 28. Multiple Choice
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
- 29. Multiple Choice
What is the empirical formula of 4-hydroxypent-2-ene?
C5H12O
C5H10O
CH2O
C5H9OH
- 30. Multiple Choice
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.
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