Among the following, which surfactant will form micelles in aqueous solution at the lowest molar concentration at ambient conditions?

[IIT-JEE, 2008]

$C H_{3} (C H_{2})_{15} N^{\oplus} (C H_{3})_{3} B r^{⊝}$

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$C H_{3} (C H_{2})_{11} O S O_{3}^{⊝} N a^{\oplus}$

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$C H_{3} (C H_{2})_{6} C O O^{⊝} N a^{\oplus}$

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$C H_{3} (C H_{2})_{11} N^{\oplus} (C H_{3})_{3} B r^{⊝}$

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Solution

The correct option is A
$C H_{3} (C H_{2})_{15} N^{\oplus} (C H_{3})_{3} B r^{⊝}$

Among the given options, the surfactant that will form micelles in aqueous solution at the lowest molar concentration at ambient conditions is $C H_{3} (C H_{2})_{15} N^{\oplus} (C H_{3})_{3} B r^{⊝} .$

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