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

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

IIT JEEIIT JEE 2008Surface Chemistry

Solution:

Larger the hydrophobic fragment of surfactant, easier will be the micellisation, smaller the crticial micelle concentration. Therefore, $CH_3(CH_2)_{15}N^+ (CH_3)_3Br^-$ will have the lowest crticial micelle concentration.