Polyhalogen Compounds
Chapter Name : Haloalkanes And Haloarenes |
Sub Topic Code : 102_12_10_07_06 |
Topic Name : Polyhalogen Compounds |
|
Sub Topic Name : P, P'-Dichlorodiphenyltrichloroethane (DDT) |
|
Introduction
1.DDT, the first chlorinated organic insecticides, was originally prepared in 1873. 2.In 1939 that Paul Muller of Geigy Pharmaceuticals in Switzerland discovered the effectiveness of DDT as an insecticide. 3.The use of DDT increased enormously on a worldwide basis after World War II, mainly because of its effectiveness against the mosquito that spreads malaria and lice that carry typhus. 4.However, problems related to extensive use of DDT began to appear in the late 1940's. 5.Many species of insects developed resistance to DDT, and it was also discovered to have a high toxicity towards fish. 6.The chemical stability of DDT and its fat solubility caused the problem. 7.DDT is not metabolized very rapidly by animals; instead, it is deposited and stored in the fatty tissues.
Pre-Requisites:
Elements, compounds
Activity:
The use of DDT increased enormously on a worldwide basis after World War II, mainly because of its effectiveness against the mosquito that spreads malaria and lice that carry typhus.
Real Life Question:
Why is DDT toxic?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Polyhalogen compounds | Carbon compounds containing more than one halogen atom are called poly halogen compounds. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Insect killer | DDT is used as an insect killer |
Real life uses :
The use of DDT increased enormously on a worldwide basis after World War II, mainly because of its effectiveness against the mosquito that spreads malaria and lice that carry typhus.
Places to visit :
Departmental store
Practical examples around us
| Examples | Explainations |
|---|---|
| DDT repellent | Mosquito killer |
What you learn in Theory:
1.DDT, the first chlorinated organic insecticides, was originally prepared in 1873. 2.In 1939 that Paul Muller of Geigy Pharmaceuticals in Switzerland discovered the effectiveness of DDT as an insecticide. 3.The use of DDT increased enormously on a worldwide basis after World War II, mainly because of its effectiveness against the mosquito that spreads malaria and lice that carry typhus. 4.However, problems related to extensive use of DDT began to appear in the late 1940's. 5.Many species of insects developed resistance to DDT, and it was also discovered to have a high toxicity towards fish. 6.The chemical stability of DDT and its fat solubility caused the problem. 7.DDT is not metabolized very rapidly by animals; instead, it is deposited and stored in the fatty tissues.
What you learn in Practice:
Polyhalogen compounds have a variety of uses