Define the following

(i) Cationic detergents

(ii) Narrow spectrum antibiotics

(iii) Disinfectants

(i) Cationic detergents

Cationic detergents are that category of synthetic detergents in which cations of the detergent molecule is involved in cleaning action and is the huge part of molecule. Chemically, Cationic detergents are quarternary ammonium salts of amines with acetates, chlorides or bromides as anions.

(ii) Narrow spectrum antibiotics

Narrow spectrum antibiotics are defined as that type of antibiotics which kill or inhibit gram-positive or gram-negative bacteria and have a narrow spectrum of action.

This means an only limited range of organisms is effected by these antibiotics.

(iii) Disinfectants

Disinfectants are the chemicals which either kill or prevent the growth of microorganisms and are applied to inanimate objects such as floors, instruments etc.

Same substances can act as antiseptics (used for living tissues) as well as disinfectants by varying concentration. (mostly concentration is more in the case of disinfectant).