Give a chemical test to distinguish between:
(i) Ethane and ethene
(ii) Ethanol and ethanoic acid
(iii) Soaps and detergents.
(i) Ethene decolorizes the yellow colour of bromine water while ethane does not.
(ii) Ethanoic acid gives a brisk effervescence with sodium hydrogen carbonate while ethanol does not.
(iii) Soaps form curdy white precipitate or scum with hard water while detergents do not form any precipitate.