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Chemistry Question on Surface Chemistry

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

A

CH3(CH2)15N+CH3Br−CH_3(CH_2)_{15}N^+CH_3Br^-

B

CH3(CH2)11OSO3−Na+CH_3(CH_2)_{11}OSO^-_3Na^+

C

CH3(CH2)6COO−Na+CH_3(CH_2)_6COO^-Na^+

D

CH3(CH2)11N+(CH3)3Br−CH_3(CH_2)_{11}N^+(CH_3)_3Br^-

Answer

CH3(CH2)15N+CH3Br−CH_3(CH_2)_{15}N^+CH_3Br^-

Explanation

Solution

Larger the hydrophobic fragment of surfactant, easier will be the micellisation, smaller the crticial micelle concentration. Therefore, CH3(CH2)15N+(CH3)3Br−CH_3(CH_2)_{15}N^+ (CH_3)_3Br^- will have the lowest crticial micelle concentration.