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Q)

Which of the following forms cationic micelles above certain concentration?

(a) Cetyltrimethylmmonium bromide

(b) Sodium dodecyl sulphate

(c) Sodium acetate

(d) Urea

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A)
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Answer: Cetyltrimethylmmonium bromide
 
Cetyltrimethylmmonium bromide, $C_{16}H_{33}N^+(CH_3)_3Br^-$ forms catinic micelles above its CMC.

 

 
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The answer is sodium acetate. In polar solvents Na+ ions are formed leading to the formation of cationic micelles.
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