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

Options

A. `CH_(3)(CH_(2))_(15)N^(+)(CH_(3))_(3)Br^(-)`
B. `CH_(3)(CH_(2))_(11)OSO_(3)^(-)Na^(+)`
C. `CH_(3)(CH_(2))_(6)COO^(-)Na^(+)`
D. `CH_(3)(CH_(2))_(11)N^(+)(CH_(3))_(3)Br^(-)`

Answer

A

Explanation

During micelle formation, number of ions decreases as a result of which conductance reduces. The formation of micelles thus also reduces the osmotic pressure thereby increasing the average molar mass of the hydrocarbon chain of the surfactant.