. Among the following, the surfactant that will form

micelles in aqueous solution at the lowest molar concentration at ambient conditions is:


Best Answer


  • The critical micelle concentration (CMC) is the surfactant concentration above which micelles develop and all subsequent surfactants added to the system get sent to micelles in colloidal systems.
  • Chain length affects CMC, i.e. the CMC is smaller as longer the hydrocarbon tail chain is.
  • Among the given options,CH3 (CH2)15 N+ (CH3)3Brpossesses the longest carbon chain.
  • As a result, it has the least CMC.

Final answer:

Hence, the correct option is A, i.e. CH(CH2)15 N+ (CH3)3Br-.


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