A) sodium dodecylbenzene sulphonate
B) sodium lauryl sulphate
C) tetramethyl ammonium chloride
D) sodium stearyl sulphate
E) cetyltrimethyl ammonium bromide
Correct Answer: E
Solution :
Cetyltrimethyl ammonium bromide is a cationic detergent. Because of being gentle, it is more expensive than anionic detergents and used in hair conditioners. \[\underset{cetyltrimethylammonium\text{ }bromide}{\mathop{\left[ C{{H}_{3}}-{{(C{{H}_{2}})}_{15}}-\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \end{smallmatrix}}{\overset{\begin{smallmatrix} C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{^{+}N}}}\,-C{{H}_{3}} \right]B{{r}^{-}}}}\,\]
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