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Among the following, the surface that will form micelles in aqueous solution at the lowest molar concentration at ambient condition is:

Options

  1. ACH 3 CH 2 15 N + CH 3 3 Br −
  2. BCH 3 CH 2 11 OSO 3 −   Na +
  3. CCH 3 CH 2 6 COO − Na +
  4. DCH 3 CH 2 11 N + CH 3 3 Br −

Correct answer

A. CH 3 CH 2 15 N + CH 3 3 Br −

Step-by-step solution

Larger the hydrophobic fragment of surfactant molecule easier will be micellisation, smaller the CMC value i.e. CH 3 CH 2 15 N + CH 3 3 Br − will have lowest CMC due to longest hydrophobic chain.

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