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(i) Antibiotics that are effective aganist a wide-range of gram - positive and gram - negative bacteria are known as broad - spectrum antibiotics, for eg. Chloramphenicol.
(ii) Disinfectants are chemical substances which kill micro - organisms but are not safe to be applied to the living tissues. Fir eg. Boric acid, Bithional, savlon, Dettol, etc.
(iii) Cationic Detergents: The detergents in which cations are major part of their molecules and are involved in the cleansing action. These are quartenary ammonium salts of amines with acetates , chlorides or bromides. for eg. Cetyltrimethylammonium bromide.