Question

Chlorobenzene reacts with trichloro acetaldehyde in the presence of ${H_2}S{O_4}$ . The major product formed is:



(A)
(B)
(C)
(D)

Answer 1

Hint: Trichloroacetaldehyde and chlorobenzene are the reactants, and the carbon centre of the carbonyl group of trichloroacetaldehyde is attacked by chlorobenzene. A dehydrating agent, sulphuric acid aids in the elimination of water molecules.

Complete step-by-step answer:We know that when Chlorobenzene reacts with trichloro acetaldehyde(chloral) as with the presence of ${H_2}S{O_4}$ we get the solution as DDT which is also said as Dichloro Diphenyl trichloroethane.
Here in this reaction ${H_2}S{O_4}$ work as a dehydration agent who removes the whole water from the reaction.
The whole reaction is as given below,




Therefore, the correct answer of this reaction is DDT (Dichloro Diphenyl trichloroethane).

Option ‘D’ is correct

Additional Information: DDT is an organochlorine and a crystalline chemical substance that has no colour, no flavour, and nearly no odour.
Although it was initially created as an insecticide, its negative effects on the environment led to its notoriety. Othmar Zeidler was the first to synthesis DDT, while Paul Hermann Müller was the first to recognise its insecticidal properties.
In the second half of World War II, it was employed to prevent the spread of insect-borne illnesses including malaria and typhus among troops and civilians.

Note: In the given reaction, carbonyl nucleophilic addition reaction takes place. The carbonyl carbon of trichloro acetaldehyde has low electron density due to presence of an oxygen atom and $-CCl_3$ group. Due to this low electron density nucleophile attaches to it to form the required product.