Among the following, 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^{+} (C H_{3})_{3} B r^{-}

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C H_{3} (C H_{2})_{11} O S O_{3}^{-} N a^{+}

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C H_{3} (C H_{2})_{6} C O O^{-} N a^{+}

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C H_{3} (C H_{2})_{11} N^{+} (C H_{3})_{3} B r^{-}

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Solution

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

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

Critical concentration for micelle formation decreases as the molecular weight of hydrocarbon chain of surfactant grows because in this case true solubility diminishes and the tendency of surfactant molecule to associate increases.

The molecular weight is maximum in case of $C H_{3} (C H_{2})_{15} N^{+} (C H_{3})_{3} B r^{-}$ .

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Similar questions

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

[IIT-JEE, 2008]

Label the hydrophilic and hydrophobic parts in the following compounds.

$C H_{3} (C H_{2})_{10} C H_{2} O S O_{3}^{-} N a^{+}$

$C H_{3} (C H_{2})_{15} N^{+} (C H_{3})_{3} B r^{-}$

$C H_{3} (C H_{2})_{16} C O O (C H_{2} C H_{2} O)_{n} C H_{2} C H_{2} O H$

K C l, C H_{3} O H

C H_{3} (C H_{2})_{11} O S O_{3}^{-} N a^{+}

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