IIT-JEE 2008 · Paper 2 · Chemistry Q52

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ChemistrySingle correct+3 / -1Question 52 of 66

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

\ce{CH3(CH2)15N+(CH3)3Br-}

\ce{CH3(CH2)11OSO3^-Na+}

\ce{CH3(CH2)6COO^-Na+}

\ce{CH3(CH2)11N+(CH3)3Br-}

Answer and worked solution

Official answer: A

Critical micelle concentration falls sharply as the hydrophobic tail gets longer (the tails gain more by escaping water). The $\ce{C16}$ chain of cetyltrimethylammonium bromide is the longest, so it forms micelles at the lowest concentration.

(A)

Topics:Colloids Soaps and detergents

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IIT-JEE 2008 · Paper 2, Chemistry question 52