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- 1. 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.
- 2. Multiple Choice
The table shows possible conditions and products for the cracking of alkanes. Which row is correct?
A
B
C
D
- 3. Multiple Choice
Which catalyst is used in the catalytic cracking of alkanes?
Concentrated phosphoric acid
Iron
Nickel
Zeolite
- 4. 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
- 5. 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
- 6. Multiple Choice
Which of these substances does not contribute to the greenhouse effect?
Unburned hydrocarbons.
Carbon dioxide.
Water vapour.
Nitrogen.
- 7. 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.
- 8. Multiple Choice
Which equation represents a termination step?
- 9. 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
- 10. Multiple Choice
Which of the following mechanisms does not occur in reactions of bromoethane?
Electrophilic addition
Elimination
Nucleophilic substitution
Radical substitution
- 11. Multiple Choice
Which species is produced in a propagation step during the reaction of propane with an excess of chlorine in the presence of UV light?
H•
C3H5Cl
C3H6CL2
C6H14
- 12. Multiple Choice
Which molecule is not produced when ethane reacts with bromine in the presence of ultraviolet light?
C2H4Br2
HBr
H2
C4H10
- 13. Multiple Choice
Which one of the following types of reaction mechanism is not involved in the above sequence?
free-radical substitution
nucleophilic substitution
elimination
nucleophilic addition-elimination
- 14. Multiple Choice
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
- 15. 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
- 16. Multiple Choice
Which one of the following reactions involves nucleophilic addition?
CH3CH = CH2 + HBr → CH3CHBrCH3
CH3CH2CH3 + Cl2 → CH3CHClCH3 + HCl
CH3CH2CH2Br + NaOH → CH3CH2CH2OH + NaBr
CH3CH2CHO + HCN → CH3CH2CH(OH)CN
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