(A) : Synthetic detergents do not contain any soap but exhibit all the properties of soaps.

(R) : Synthetic detergents give foam even in hard water.

The synthetic detergents have all the qualities of soaps despite not containing any soap. Synthetic detergents can be used in both soft and hard water because, unlike soaps, they produce foam even in hard water. Some detergents have the ability to produce foam in even ice-cold water. Synthetic detergents, in contrast to soaps, can be utilised in an acidic medium while soaps precipitate there.