(i) Soap molecules have two ends- one end is the hydrocarbon chain which is water repellent, whereas the other end is the ionic part which it water-soluble end. When soap is dissolved in water it forms a group of many molecules, known as micelle
(ii) These micelles are formed because their hydrocarbon chains come together and the polar ends are projected outwards.
(iii) Micelle formation in ethanol will not occur because the hydrocarbon chain end of the soap will dissolve in ethanol.
(iv) Soaps in the form of a micelle are able to clean dirty clothes having oily spots, as the oily dirt is collected in the centre of the micelle, which forms an emulsion in water and on rinsing, the water washes away the micelles with dirt attached to them