Sodium stearate ${CH}_{3} {({CH}_{2})}_{16} {COO}^{-} {Na}^{+}$ is an anionic surfactant which forms micelles in oil. Choose the correct statement for it from the following.

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It forms spherical micelles with ${CH}_{3} {({CH}_{2})}_{16}$ - group pointing outwards on the surface of sphere.

It forms non-spherical micelles with ${CH}_{3} {({CH}_{2})}_{16}$ - group pointing towards the centre.

It forms spherical micelles with ${CH}_{3} {({CH}_{2})}_{16}$ - group pointing towards the centre of sphere.

It forms non-spherical micelles with $- {COO}^{(-)}$ - group pointing outwards on the surface.

answer is D.

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Detailed Solution

Hydrocarbon chain is known as non-polar tail. The ${RCOO}^{-} ions$ consists of a long hydrocarbon chain which is hydrophobic and a polar group which is hydrophilic. At the higher concentration ${RCOO}^{-} ions$ form an aggregate of spherical shape towards the center and the $- ({COO}^{(-)})$ polar part facing outward on the surface of the sphere.