Explain the following terms with suitable examples. (i) cationic detergents (ii) anionic detergents and (iii) non-ionic detergents.
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Solution
(i) Cationic detergents : Quaternary ammonium salts of acetates, chlorides or bromides in which the cationic part has a long hydrocarbon chain and N atom has positive charge are cationic detergents.
Example includes cetyltrimethylammonium bromide.
(ii) Anionic detergents: Sodium alkyl sulphates and sodium alkyl benzene sulphonates are anionic detergents. Examples include sodium lauryl sulphate, sodium stearyl sulphate, etc.
(iii) Non-ionic detergents: They do not contain ions. They are esters of alcohols with high molecular mass. They can be prepared by the reaction between stearic acid and polyethylene glycol.