. Among the following, the surfactant that will form
micelles in aqueous solution at the lowest molar concentration at ambient conditions is:
- 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)3Br- possesses the longest carbon chain.
- As a result, it has the least CMC.
Hence, the correct option is A, i.e. CH3 (CH2)15 N+ (CH3)3Br-.