JEE Main Chemistry question

Chemistry Chemistry in Everyday Life JEE Main

Not in JEE Main or NEET syllabus

Which of the following is not a surfactant?

(A)CH_3-(CH_2)_{15}-N^+(CH_3)_3\,Br^-
(B)CH_3-(CH_2)_{14}-CH_2NH_2Correct
(C)CH_3-(CH_2)_{16}-CH_2OSO_3^-Na^+
(D)OHC-(CH_2)_{14}-CH_2-COO^-Na^+

Answer: (B)

Solution

Every surfactant has both a hydrophobic (non-polar hydrocarbon) part and a hydrophilic (polar/ionic) part; CH_3-(CH_2)_{14}-CH_2NH_2 is simply a long-chain primary amine with only a weakly polar, largely non-ionised group and no properly ionic hydrophilic head under

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Question ID VK-151752