DDT is manufactured by acid catalysed condensation of :

Options

A. Chloroform and acetone
B. Chloroform and nitric acid
C. Chlorobenzene and chloral
D. Chlorobenzene and chloroform

Answer

To solve the question regarding the manufacturing of DDT (Dichlorodiphenyltrichloroethane) through acid-catalyzed condensation, we can break down the process step by step.

### Step-by-Step Solution:

1. **Understanding DDT**:
- DDT stands for Dichlorodiphenyltrichloroethane. It is an insecticide that was widely used in agriculture.

2. **Identifying the Reactants**:
- DDT is synthesized from two main reactants: chlorobenzene and chloral.
- Chlorobenzene (C6H5Cl) is a derivative of benzene where one hydrogen atom is replaced by a chlorine atom.
- Chloral (CCl3CHO) is an organic compound that contains a carbonyl group (C=O) and three chlorine atoms attached to the same carbon.

3. **Acid-Catalyzed Condensation**:
- The process involves the use of an acid catalyst (commonly concentrated sulfuric acid, H2SO4) to facilitate the reaction.
- During the reaction, a water molecule is eliminated, which is characteristic of condensation reactions.

4. **Reaction Mechanism**:
- Two molecules of chlorobenzene react with one molecule of chloral in the presence of the acid catalyst.
- The reaction proceeds through the formation of an intermediate, followed by the elimination of water to form DDT.

5. **Formation of DDT**:
- The structure of DDT can be visualized as two chlorobenzene rings connected to a trichloroethane group.
- The final structure of DDT is represented as:
\[ \text{C}_6\text{H}_4\text{Cl} - \text{C}(C\text{Cl}_3) - \text{C}_6\text{H}_4\text{Cl} \]
- This structure shows that DDT consists of two chlorobenzene rings linked to a carbon atom that is also bonded to three chlorine atoms.

6. **Conclusion**:
- Therefore, the acid-catalyzed condensation of chlorobenzene and chloral leads to the formation of DDT.

### Final Answer:
DDT is manufactured by the acid-catalyzed condensation of **chlorobenzene and chloral**.

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