The compound formed on heating chlorobenzene with chloral in the presence of concentrated sulphuric acid is:(A) Freon(B) DDT(C) Gammaxene(D) Hexachloroethane

To solve the question regarding the compound formed on heating chlorobenzene with chloral in the presence of concentrated sulfuric acid, let's break down the components involved in this reaction:

Chlorobenzene: This is a benzene ring (C6H6) with one chlorine atom substituting a hydrogen atom.

Chloral: Chloral (CCl3CHO) is an organic compound that contains three chlorine atoms and an aldehyde functional group.

Concentrated Sulfuric Acid: This is a strong acid that can act as a dehydrating agent and catalyst in organic reactions.

Reaction Process
When chlorobenzene and chloral are heated together in the presence of concentrated sulfuric acid, a condensation reaction occurs. In this case, chloral can react with chlorobenzene to form a compound through the process of electrophilic aromatic substitution, leading to the production of DDT (Dichloro-Diphenyl-Trichloroethane).

Formation of DDT
The specific steps can be summarized as follows:

Electrophilic Aromatic Substitution: The chlorine atoms in chloral make it a powerful electrophile, which can react with the aromatic ring of chlorobenzene.
Formation of DDT: Through further reactions and chlorination, DDT is produced. DDT is characterized by its structure which includes a central ethane group with two phenyl groups substituted with chlorine atoms.
Answer
The compound formed on heating chlorobenzene with chloral in the presence of concentrated sulfuric acid is: (B) DDT.