# Which one of the following is not a surfactant ?

$\qquad(b)\;CH_{3}-(CH_{2})_{14}-CH_{2}-NH_{2}\qquad(c)\;CH_{3}-(CH_{2})_{16}-CH_{2} OSO_{2}^{-}Na^{+}\qquad(d)\;OHC-(CH_{2})_{14}-CH_{2}-COO^{-}Na^{+}$

Answer : $\;CH_{3}-(CH_{2})_{14}-CH_{2}-NH_{2}$
Explanation :
A surfactant is briefly defined as a material that can greatly reduce the surface tension of water when used in very low concentrations . A particular type of molecular structure which is made up of a water soluble (hydrophillic) and a water insoluble (hydrophobic) component .
$CH_{3}-(CH_{2})_{14}-CH_{2}-NH_{2}\;$ is a $\;1^{0}\;$ amine is not a surfactant .