Question

Give preparation and uses of D.D.T.

Answer 1

DDT (Dichloro Diphenyl Trichloroethane):

• The molecular formula of DDT is ${\mathrm{C}}_{14}{\mathrm{H}}_9{\mathrm{Cl}}_5$
• It is an organic compound that is colorless, odorless, and tasteless.

Preparation:

• DDT is prepared by heating Chloral $\left({\mathrm{C}}_2{\mathrm{HCl}}_3\mathrm{O}\right)$ and Chloro benzene $\left({\mathrm{c}}_6{\mathrm{H}}_5\mathrm{Cl}\right)$ by heating in a ratio of $1:2$ in the presence of conc. Sulphuric acid $({\mathrm{H}}_2\mathrm{SO}{}_4)$.
• Here, in the reaction, 2 molecules of Chlorobenzene react with one molecule of Chloral $\left({\mathrm{C}}_2{\mathrm{HCl}}_3\mathrm{O}\right)$ in the presence of Sulphuric acid form Dichloro Diphenyl Trichloroethane (DDT).

Uses:

• DDT is used as an insecticide.
• It can also be used as a mosquito repellent.

Therefore, the preparation of benzene is by heating Chloral and Chloro benzene in the ratio of $1:2$ using conc. Sulphuric acid and it can be used as Insecticide and Pesticide.