DDT is prepared by condensing chlorobenzene with

Options

A. hexachloroethane
B. chloroform
C. chloral
D. methyl chloride

Explanation

To solve the question regarding the preparation of DDT (Dichlorodiphenyltrichloroethane), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactants**:
DDT is synthesized from chlorobenzene and chloral. The chemical structure of chlorobenzene is C6H5Cl, and chloral is CCl3CHO.

2. **Write the Reaction**:
The reaction involves two molecules of chlorobenzene reacting with one molecule of chloral. The overall reaction can be represented as:
\[ 2 \text{C}_6\text{H}_5\text{Cl} + \text{CCl}_3\text{CHO} \rightarrow \text{DDT} + \text{H}_2\text{O} \]

3. **Role of Dehydrating Agent**:
The reaction requires a dehydrating agent to facilitate the condensation process. Concentrated sulfuric acid (H2SO4) is commonly used for this purpose. It helps in removing water formed during the reaction.

4. **Mechanism of the Reaction**:
- The chloral reacts with chlorobenzene, leading to the formation of an intermediate.
- The concentrated sulfuric acid removes water from the intermediate, allowing the formation of DDT.

5. **Final Product**:
The final product of this reaction is DDT, which has the chemical formula C14H9Cl5.

### Conclusion:
Thus, DDT is prepared by condensing chlorobenzene with chloral in the presence of a dehydrating agent like concentrated sulfuric acid.