JEE Advanced 2008 Chemistry question

Not in JEE Main or NEET syllabus

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

(A)\mathrm{CH_3(CH_2)_{15}N^+(CH_3)_3Br^-}Correct
(B)\mathrm{CH_3(CH_2)_{11}OSO_3^-Na^+}
(C)
(D)\mathrm{CH_3(CH_2)_{11}N^+(CH_3)_3Br^-}

Answer: (A)

Solution

The critical micelle concentration falls as the hydrophobic tail gets longer, because a longer chain is driven more strongly out of water into the micelle core. The

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Question ID VK-037656