1.

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

Answer»

`(CH_(3))(CH_(2))_(15)N^(+)(CH_(3))_(3)Br^(-)`
`CH_(3)(CH_(2))_(11)OSO_(3)^(-)Na^(+)`
`CH_(3)(CH_(2))_(6)COO^(-)Na^(+)`
`CH_(3)(CH_(2))_(11)N^(+)(CH_(3))_(3)Br^(-)`

Solution :LONGER the CARBON chain, i.e., greater is the size of the hydrophobic chain (tail), less is the solubility in water and greater is the tendency of surfactant molecules to asscoated to form micelle, i.e., lower is the cmc. HENCE (a) with the longest. carbon chain has the LOWEST cmc. [In fact, log (cmc) =A -B (C#)]


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