Question

Which of the following forms cationic micelles above certain concentrations?

• A. Sodium dodecyl sulphate
• B. Urea
• C. Sodium acetate
• D. Cetyl trimethyl ammonium bromide

Answer 1

The correct option is D Cetyl trimethyl ammonium bromide

Sodium dodecyl sulphate and sodium acetate form anionic micelles due to larger size anions.

Alkyl trimethyl ammonium ion aggregates to form a cationic micelle.

The reaction is as follows:

$R(C{H}_3{)}_{3}NBr\to R(C{H}_3{)}_3{N}^{+}+B{r}^{-}$