Define the following:
(a) Anionic detergents
(b) Limited spectrum antibiotics
(c) Antiseptics

Explanation

(a) Anionic detergents: These are so called because a large part of their molecules are anions.
these are of two types:
(a) Sodium alkyl sulphates: for example, sodium lauryl sulphate `C_(17)H_(23)CH_(2)OSO_(3)Na`
(b) Sodium alkyl benzene sulphonates:

(b) Limited spectrum antiobiotics: Antibiotics which are are specific for certain desease only. Ex: pencillin. Streptomycin for tuberculosis etc.
(c) Antiseptics: They are the chemical substances which prevent the growth of micro-organism and may even kill them. they are safe to be applied to living tissues.
For example, Dettol, Savlon, Iodine, Boric aciid etc.