Alkanes — Paper 2 · IGCSE Chemistry (9-1) 0971

35 Which equation representing a reaction of methane is correct? A CH4 + Cl 2 → CH3Cl + HCl B CH4 + Cl 2 → CH4Cl 2 C CH4 + Cl 2 → CH2Cl 2 + H2 D 2CH4 + 2Cl 2 → 2CH3Cl + Cl 2 + H2

1 marks

Answer: A

This question in 0971/22 Oct/Nov 2018

37 Chlorine reacts with methane. Which statements are correct? 1 The reaction takes place in the dark. 2 The reaction of chlorine with methane forms chloromethane. 3 Chloromethane reacts with chlorine to produce dichloromethane. 4 The reaction of chlorine with methane is an addition reaction. A 1 and 2 B 1 and 3 C 2 and 3 D 3 and 4

1 marks

Answer: C

This question in 0971/21 May/June 2019

39 Ethane, C2H6, reacts with chlorine in a substitution reaction. What are the products of this reaction? A chloroethane and hydrogen B chloroethane and hydrogen chloride C chloroethene and hydrogen D chloroethene and hydrogen chloride

1 marks

Answer: B

This question in 0971/21 May/June 2020

39 Alkanes undergo substitution reactions in the presence of UV light. Which equation represents a substitution reaction of ethane? A C2H6 + Cl 2 → C2H4 + 2HCl B C2H6 + Cl 2 → C2H5Cl + HCl C C2H6 + Cl 2 → C2H4Cl 2 + H2 D C2H6 + HCl → C2H5Cl + H2

1 marks

Answer: B

This question in 0971/22 May/June 2020

36 Which statement about alkanes is correct? A They burn in oxygen. B They contain carbon, hydrogen and oxygen atoms. C They contain double bonds. D They contain ionic bonds.

1 marks

Answer: A

This question in 0971/21 May/June 2021

35 Which pair of formulae represents two alkanes? A CH4 and C8H18 B C2H6 and C5H8 C C3H6 and C5H12 D C10H8 and C4H8

1 marks

Answer: A

This question in 0971/22 May/June 2021

36 Which statement about alkanes is correct? A They burn in oxygen. B They contain carbon, hydrogen and oxygen atoms. C They contain double bonds. D They contain ionic bonds.

1 marks

Answer: A

This question in 0971/22 May/June 2021

19 Which reaction is a photochemical reaction? A addition of bromine to propene B esterification of ethanol and ethanoic acid C oxidation of ethanol D substitution of methane with chlorine

1 marks

Answer: D

This question in 0971/22 Oct/Nov 2021

37 Some properties of colourless liquid L are listed. ● It boils at 65 C. ● When added to water, two layers form which do not mix. ● It does not react with sodium carbonate. ● It has no effect on bromine water. What is L? A ethanol B hexane C hexene D ethanoic acid

1 marks

Answer: B

This question in 0971/21 May/June 2022

38 A molecule of compound P contains two carbon atoms and four hydrogen atoms. Which row represents P? name of reacts with compound aqueous bromine ethane ethene ethene ethene

1 marks

Answer: C

This question in 0971/21 May/June 2022

38 The structures of some hydrocarbons are shown. 1 2 3 4 H H H H H H H H H H H C C H H C H H C C C H H C C C C H H H H H H H H H H H H H C C H H C C C H H H H H H Which statement about the hydrocarbons is correct? A 1 and 2 have a different general formula. B 1 and 4 are in different homologous series. C 2 and 3 are structural isomers. D 3 and 4 have the same empirical formula.

1 marks

Answer: D

This question in 0971/22 May/June 2022

39 Ethane reacts with chlorine in the presence of ultraviolet light. Which substances are produced in the reaction? 1 2 3 4 H H H H H H H C C Cl H C C H H Cl H H Cl Cl A 1, 2 and 3 B 1 and 3 only C 2, 3 and 4 D 2 and 4 only

1 marks

Answer: C

This question in 0971/22 May/June 2022

35 Methane reacts with chlorine in the presence of ultraviolet light. Which substance is not produced in this reaction? A B C D H Cl H H H Cl H C Cl H C Cl H H

1 marks

Answer: A

This question in 0971/22 Oct/Nov 2022

32 The structural formulae of two hydrocarbons are shown. CH3CH2CH2CH3 CH3CH(CH3)CH3 Which statement about the hydrocarbons is correct? A They are both alkenes. B They decolourise aqueous bromine. C They are structural isomers. D They undergo addition reactions.

1 marks

Answer: C

This question in 0971/21 May/June 2023

36 Alkanes undergo substitution reactions in the presence of UV light. Which equation represents a substitution reaction of ethane? A C2H6 + Cl 2 → C2H4 + 2HCl B C2H6 + Cl 2 → C2H5Cl + HCl C C2H6 + Cl 2 → C2H4Cl 2 + H2 D C2H6 + HCl → C2H5Cl + H2

1 marks

Answer: B

This question in 0971/22 May/June 2023

37 Methane reacts with chlorine in substitution reactions. How many different products, containing a single carbon atom, can be made during the reactions? A 2 B 3 C 4 D 5

1 marks

Answer: C

This question in 0971/22 May/June 2023

34 What is the total number of covalent bonds in a molecule of butane, C4H10? A 3 B 10 C 13 D 14

1 marks

Answer: C

This question in 0971/22 Oct/Nov 2023

35 Propane reacts with chlorine in a substitution reaction. Which reaction condition is required for the reaction to occur? A acid catalyst B iron catalyst C temperature of 400 C D ultraviolet light

1 marks

Answer: D

This question in 0971/22 Oct/Nov 2023

39 Propane reacts with chlorine. Which statements about this reaction are correct? 1 Ultraviolet light is used to provide the activation energy. 2 Propane undergoes an addition reaction. 3 One of the products is CH3CH2Cl. 4 One of the products is HCl. A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: B

This question in 0971/21 May/June 2024

31 Which statement explains why ethanoic acid is saturated? A The molecule dissociates completely in water. B There is a carbon–oxygen double bond in the molecule. C The carbon–carbon bond in the molecule is a single bond. D All the carbon–hydrogen bonds in the molecule are single bonds.

1 marks

Answer: C

This question in 0971/22 Oct/Nov 2024

33 Which row shows the properties of methane? gives a positive soluble state at room test with in water temperature aqueous bromine A no gas no B no gas yes C yes liquid no D yes liquid yes

1 marks

Answer: A

This question in 0971/22 Oct/Nov 2024

35 Ethane reacts with chlorine in the presence of ultraviolet light. Which products are formed? A Cl CH2CH2Cl and H2 B 2CH3Cl and H2 C C2H5Cl and HCl D CH2=CH2 and 2HCl

1 marks

Answer: C

This question in 0971/22 May/June 2025