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 \[\underset{\text{Chlorobenzene}}{\mathop{2{{C}_{6}}{{H}_{5}}Cl}}\,+\underset{\begin{smallmatrix}  \text{Trichloro} \\  \text{acetaldehyde} \end{smallmatrix}}{\mathop{CC{{l}_{3}}CHO}}\,\xrightarrow{con.{{H}_{2}}S{{O}_{4}}}CC{{l}_{3}}CH\]