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Soaps are the sodium or potassium salts of

  1. Along-chain alkyl hydrogen sulphates only
  2. Blong-chain fatty (carboxylic) acids
  3. Cglycerol
  4. Dbenzenesulphonic acid

Answer: B

A soap is the alkali-metal salt of a higher fatty acid such as stearic, palmitic or oleic acid. Sulphates and sulphonates are the anions of synthetic detergents, and glycerol is the by-product of soap making. Hence the answer is the long-chain fatty acids.
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