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Which of the following forms cationic micelles when its concentration exceeds a certain limit?

1. Sodium dodecyl sulphate
2. Sodium acetate
3. Urea
4. Cetyl trimethyl ammonium bromide

Correct answer: Cetyl trimethyl ammonium bromide

Solution

Cetyl trimethyl ammonium bromide has a positively charged head group, so above its CMC it forms cationic micelles. (SDS is anionic.)

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