→ Soap molecules, as shown in the diagram, have a negatively charged (hydrophilic) “head” and a hydrophobic ‘tail’ consisting made up of fatty acids.

→ Hydrophobic tails are attracted to the grease particles and attach themselves. 

→ The hydrophilic heads, at the same time, are attracted to water molecules. This chain of attractions will lift grease off the fabric and suspend it in the water.

→ Soap molecules contain a non-polar hydrophobic hydrocarbon tail and a polar hydrophilic head.

→ The non-polar tail forms dispersion forces with the oil molecule while the polar head forms ion-dipole forces with the polar water molecules.

→ The resulting orientation has the tail within the oil and the head group at the surface of the oil and water.

`=>D`