MSH Chemistry Nov 2022 Paper 3

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Question 1 8 marks

The structures of seven compounds, A, B, C, D, E, F and G, are shown.

Figure 1: Structures of compounds A, B, C, D, E, F and G.

Answer the following questions about these structures. Each structure may be used once, more than once or not at all.

1(a) State which structure, A, B, C, D, E, F or G, represents each compound.

Choose one letter for each part. Each part is worth 1 mark.

1(a)(i) A compound that contributes to acid rain 1 1(a)(ii) A product of respiration 1 1(a)(iii) A hydrocarbon that decolourises aqueous bromine 1 1(a)(iv) A carboxylic acid 1 1(a)(v) A compound that is the main constituent of natural gas 1

1(b) Compound C can be produced by cracking the kerosene fraction of petroleum. 1(b)(i) State the meaning of the term cracking. 2

For full marks, include what happens to the hydrocarbon molecules and the condition/process involved.

1(b)(ii) Complete the chemical equation for the cracking of C₁₃H₂₈ to form C₈H₁₈ and one other hydrocarbon. 1

C₁₃H₂₈ → C₈H₁₈ +