Name the product formed when hydrogen is added to ethene.

4 Name the hydrocarbon formed when ethanol is heated with cone. H₂S0₄ at 170 �C? What is this reaction known as? 5 Why does ethyne (acetylene) burn with a sooty flame? 7 Explain why, ethene decolourises bromine water whereas ethane does not. 8 Name two catalysts which can be used in the hydrogenation of unsaturated compounds.