(a) Define the term 'homologous series' as used in organic chemistry. State THREE characteristics of a homologous series. [4 marks] (b) Consider the following organic compounds: ethane, ethene, ethanol, ethanoic acid, and ethyl ethanoate. (i) Write the structural formula of each compound. [5 marks] (ii) Identify the functional group present in ethanol, ethanoic acid, and ethyl ethanoate. [3 marks] (c) Ethene undergoes addition polymerization to form polyethene. (i) Write a balanced chemical equation for the polymerization of ethene. [2 marks] (ii) State ONE industrial use of polyethene. [1 mark]