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Which one of the following forms micelles in aqueous solution above certain concentration?

1. Dodecyl trimethyl ammonium chloride
2. Glucose
3. urea
4. Pyridiniumchloride

Correct answer: Dodecyl trimethyl ammonium chloride

Solution

Dodecyl trimethyl ammonium chloride is a surfactant: it has a long hydrocarbon chain and a polar ionic head, so it self-assembles into micelles above its critical micelle concentration. Glucose and urea are small, highly water-soluble molecules, and pyridinium chloride lacks the long hydrophobic tail needed for micellization.

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