NTA Abhyas 2020
- Exam
- NTA Abhyas
- Year
- 2020
- Subject
- Chemistry
- Chapter
- Surface Chemistry
NTA Abhyas 2020 · Chemistry · Surface Chemistry
Among the following, the surface that will form micelles in aqueous...
Among the following, the surface that will form micelles in aqueous solution at the lowest molar concentration at ambient condition is:
Options
- A{\text{CH}_{3} {\left({\text{CH}_{2}\right)}_{\text{15}} N^{+} {\left({\text{CH}_{3}\right)}_{3} {\text{Br}^{−}
- B{\text{CH}_{3} {\left({\text{CH}_{2}\right)}_{\text{11}} {\text{OSO}_{3}^{−} {\text{Na}^{+}
- C{\text{CH}_{3} {\left({\text{CH}_{2}\right)}_{6} {\text{COO}^{−} {\text{Na}^{+}
- D{\text{CH}_{3} {\left({\text{CH}_{2}\right)}_{\text{11}} N^{+} {\left({\text{CH}_{3}\right)}_{3} {\text{Br}^{−}
Correct answer
A. {\text{CH}_{3} {\left({\text{CH}_{2}\right)}_{\text{15}} N^{+} {\left({\text{CH}_{3}\right)}_{3} {\text{Br}^{−}
Step-by-step solution
Larger the hydrophobic fragment of surfactant molecule easier will be micellisation, smaller the CMC value i.e. {\text{CH}_{3} {\left({\text{CH}_{2}\right)}_{\text{15}} N^{+} {\left({\text{CH}_{3}\right)}_{3} {\text{Br}^{−} will have lowest CMC due to longest hydrophobic chain.