Trichloroacetaldehyde, ${\mathrm{CCl}}_3\mathrm{CHO}$ reacts with chlorobenzene in presence of sulphuric acid and produces :-

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When we react Chloral with Chlorobenzene it leads to the formation of DDT (Dichloro Diphenyl Trichloroethane) which is used as an insecticide. 


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