Under ambient conditions, which among the following surfactants will form micelles in aqueous solution at lowest molar concentration?

A
${CH}_{3} - {({CH}_{2})}_{8} - COO - {Na}^{+}$
B
${CH}_{3} {({CH}_{2})}_{11} \overset{\oplus}{N} {({CH}_{3})}_{3} Br$
C
${CH}_{3} - {({CH}_{2})}_{13} - {OSO}_{3}^{-} {Na}^{+}$
D
${CH}_{3} {({CH}_{2})}_{15} \overset{\oplus}{N} {({CH}_{3})}_{3} Br$

Solution:

Greater the surface area, greater the van der waal forces of attraction and therefore at lesser concentration micelle formation will take place. In case of ${CH}_{3} {({CH}_{2})}_{15} \overset{\oplus}{N {({CH}_{3})}_{3} {Br}^{-}}$ due to greater chain length, greater will be van der waal forces.

Solution:

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