Protogenic compound: Protogenic compound are those which gives proton in non aqueous media.
On the basis of proton interaction, solvents are of four types,
(i) Protophilic solvents. Example: water, alcohol, liquid ammonia, etc.
(ii) Protogenic solvents. Example: water, liquid hydrogen chloride, glacial acetic acid, etc.
(iii) Amphiprotic solvents. Example: water, ammonia, ethyl alcohol, etc.
(iv) Aprotic solvents. Example: benzene, carbon tetrachloride, carbon disulphide, etc
