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Which of the following is a cationic detergent?
A
Sodium stearate
B
Cetyltrimethylammonium bromide
C
Sodium dodecylbenzene sulphonate
D
Sodium lauryl sulphate
Detailed Solution
Cationic detergents are quaternary ammonium salts of amines with acetates, chlorides or bromides.
Cetyltrimethylammonium bromide, $CH_3(CH_2)_{15}N^+(CH_3)_3Br^-$, is a cationic detergent.
(Sodium stearate is a soap; sodium dodecylbenzene sulphonate and sodium lauryl sulphate are anionic detergents.)