1-butanol is widely used in the manufacturing industry such as plastics, polymers, lubricants. brake fluids, synthetic rubber and as a source of fuel. 4-cyclopropyl-1-butanol, an aliphatic alcohol with the molecular formula C7H14O has a few constitutional isomers. Three of the constitutional isomers have the following characteristics: (a) Construct the isomers X,Y and Z using expanded, condensed and skeletal structures respectively. [3 marks] (b) Construct a functional group isomer for 4-cyclopropyl-1-butanol and state its functional group. [2 marks] (c) Determine the optical activity of isomers X and Z. Explain your answer. [5 marks] (d) Draw a pair of enantiomers for the optically active compound in (c). [2 marks]