WAEC Chemistry 2018 Paper

Concept:Dehydration of ethanol produces ethene by removing a molecule of water.Explanation:Ethanol is heated with an excess of concentrated sulphuric acid ($\mathrm{H_2SO_4}$) or phosphoric acid ($\mathrm{H_3PO_4}$).These acids act as dehydrating agents.They remove a water molecule from ethanol ($\mathrm{C_2H_5OH}$).This forms ethene ($\mathrm{C_2H_4}$) as the product.Therefore, dehydration is the correct process.Answer:D. dehydration