question_answer

To get DDT chlorobenzene has to react with the following compound in the pressure of concentrated sulphuric acid :

A)  trichloro ethane

B)  dichloro acetone

C)  dichloro acetaldehyde

D)  trichloro acetaldehyde

Correct Answer: D

Solution :

D.D.T. is dichloro-diphenyl trichloro-ethane. It can be prepared by treating chlorobenzene with chloral. \[\underset{Chlorobenzene}{\mathop{2{{C}_{6}}{{H}_{5}}Cl}}\,+\underset{\begin{smallmatrix}  Trichloro \\  acetaldehyde \end{smallmatrix}}{\mathop{CC{{l}_{3}}CHO}}\,\xrightarrow{con.\,{{H}_{2}}S{{O}_{4}}}CC{{l}_{3}}CH\]