Which of the following is not a surfactant? (a) \( \mathrm{CH}_{3}\left(\mathrm{CH}_{2}\right)_{...

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Which of the following is not a surfactant?
(a) \( \mathrm{CH}_{3}\left(\mathrm{CH}_{2}\right)_{15} \mathrm{~N}^{+}\left(\mathrm{CH}_{3}\right)_{3} \mathrm{Br}^{-} \)
(b) \( \mathrm{CH}_{3}\left(\mathrm{CH}_{2}\right)_{14} \mathrm{CH}_{2} \mathrm{NH}_{2} \)
(c) \( \mathrm{CH}_{3}\left(\mathrm{CH}_{2}\right)_{16} \mathrm{CH}_{2} \mathrm{OSO}_{3}^{-} \mathrm{Na}^{+} \)
(d) \( \mathrm{OHC}\left(\mathrm{CH}_{2}\right)_{14} \mathrm{CH}_{2} \mathrm{COO}^{-} \mathrm{Na}^{+} \)
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