Question:
Which of the following forms cationic micelles above a certain minimum concentration?
Which of the following forms cationic micelles above a certain minimum concentration?
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Cationic surfactants have quaternary ammonium groups.
Updated On: Apr 23, 2026
- Sodium dodecyl sulphate
- Sodium acetate
- Urea
- Cetyl trimethyl ammonium bromide
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Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Formula / Definition}
\[ \text{Cationic surfactant} \Rightarrow \text{positively charged head group} \]
Step 2: Calculation / Simplification}
Cetyl trimethyl ammonium bromide (\(\mathrm{C_{19}H_{42}BrN}\)) has \(\mathrm{R_4N^+}\) head group (cationic).
Sodium dodecyl sulphate is anionic. Sodium acetate and urea do not form micelles.
Step 3: Final Answer
\[ \text{Cetyl trimethyl ammonium bromide} \]
\[ \text{Cationic surfactant} \Rightarrow \text{positively charged head group} \]
Step 2: Calculation / Simplification}
Cetyl trimethyl ammonium bromide (\(\mathrm{C_{19}H_{42}BrN}\)) has \(\mathrm{R_4N^+}\) head group (cationic).
Sodium dodecyl sulphate is anionic. Sodium acetate and urea do not form micelles.
Step 3: Final Answer
\[ \text{Cetyl trimethyl ammonium bromide} \]
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