Question

DDT can be prepared by reacting chlorobenzene in the presence of conc.\[{H_2}S{O_4}\] with ______.

Answer 1

Hint: The full form of DDT is dichlorodiphenyltrichloroethane. DDT is a colourless, odourless, tasteless, crystalline chemical compound. The compound to which it reacts is an aldehyde.

Complete Step by Step Solution:
DDT or dichlorodiphenyltrichloroethane is used as an insecticide in agriculture. The chemical formula of DDT is \[{C_{14}}{H_9}C{l_5}\] . The compound is present as a colourless and tasteless crystalline solid in its standard condition for temperature and pressure.
DDT is prepared by reacting chloral and chlorobenzene in presence of concentrated sulphuric acid in a ratio of 1:2.
Chloral is an organic compound having a molecular formula of \[C{l_3}CCHO\]. The other name of chloral is trichloroacetaldehyde or trichloroethanal. It is a colourless oily aldehyde compound which shows solubility in most solvents.
The reaction between chlorobenzene and chloral is shown below.

Image: Preparation of DDT
In the above reaction, two moles of chlorobenzene reacts with one mole of chloral in presence of concentrated sulphuric acid to form dichlorodiphenyltrichloroethane.
Therefore, DDT can be prepared by reacting chlorobenzene in the presence of conc.\[{H_2}S{O_4}\] with chloral.
Additional information: DDT is now banned in different countries as it is a very toxic compound and due to its high usage it leads to death. Chloral on dissolving in water forms chloral hydrate.

Note: Sometimes it may be confusing while drawing the structure of DDT as it is a germinal compound where two benzyl chloride group is attached to one carbon and only one chlorine group is on the other carbon atom.