Insecticides are chemicals that destroy or kill insects. Insecticides  are of two types: Natural or Synthetic.
DDT (Dichloro diphenyl trichloroethane) is the most well known because of its being the first major synthetic pesticide and later its persistent toxicity.

DDT Powder
Example of Synthetic Insecticides:
Organochlorines: Chlorine containing carbon, non biodegradable, persistent, fat soluble, show biomagnifications.
e.g.,DDT, BHC, Aldrin, Endrin, Dildrin, Endosulphane.

Organosulphates: Esters of phosphoric acid, Malathion, Parathion, Ethion, Tetra Ethyl Pyro Phosphate (TEPP) etc.

Carbamates: Derivatives of Carbamic acid, Bygon, Carbofuran.
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