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Under ambient conditions, which among the following surfactants will form micelles in aqueous solution at lowest molar concentration?

Options

  1. ACH 3 CH 2 11 N ⊕ CH 3 3 Br _
  2. BCH 3 - CH 2 13 - OSO 3 - Na +
  3. CCH 3 CH 2 15 N ⊕ CH 3 3 Br ⊝
  4. DCH 3 — CH 2 8 — COO ⊝ Na +

Correct answer

C. CH 3 CH 2 15 N ⊕ CH 3 3 Br ⊝

Step-by-step solution

CMC is inversely related to the length of hydrophobic chain. C 16 H 33   N + C H 3 3 B r - forms cationic micelle with longest hydrophobic chain and at lowest CMC value.

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