63. (i) Formed by the dehydration of ethanol by concentrated sulphuric acid.   64. (ii) Which will give red precipitate with ammoniacal cuprous chloride solution.   65. (iii) Which forms methanoic acid on oxidation in the presence of copper at 200oC.   66. (iv) Which has vapour density 14 and turns alkaline potassium permanganate green.   67. (v) Which forms chloroform on halogenation in the presence of sunlight.   68. (vi) Which decolourises bromine solution in carbon tetrachloride.