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  4. Which of the following forms cationic micelles above certain concentration?

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Q. Which of the following forms cationic micelles above certain concentration?

AIPMTAIPMT 2004Chemistry in Everyday Life

Solution:

Cetyl trimethyl ammonium bromide forms cationic micelles above a certain concentration. In the molecule of detergents and soap, the negative ions aggregate to form a micelle of colloidal size. In polar medium (like water), the negative ion has a long hydrocarbon chain and a polar group$ (-COO^-)$ at one end and on other end, it has $N^+$ ion, thus cationic micelle is formed.