Question

"the disturbance by a source of sound in the medium travels through the medium and not the particles of the medium".justify this statement.

Answer 1

The vibrations produced by an object set the partiricles of the medium around the object into vibrations.
These vibrating particles do not travel all the way from the vibrating object to ear. These vibrating particles exert a force on the adjacent particles of the medium. Due to this force, the adjacent particles get displaced from their position of rest.
These displaced vibrating particles then disturb their immediate adjacent particles and the process continues in the medium till the sound reaches our ear.
Therefore it is said that the disturbance by a source of sound in the medium travels through the medium and not the particles of the medium.