[Hint : (i) Those in which cationic part of the molecule is involved in cleansing action. E.g., cetyltrimethyl ammonium bromide.
(ii) Those in which anionic part of the molecule is involved in cleansing
action. E.g., sodium laurylsulphate.
(iii) Which do not contain any ion in their constitution. E.g., Lauryl alcohol ethoxylate.]
