The compound formed on heating chlorobenzene with chloral in the presence of concentrated sulphuric acid is-

Options

A. Gammaxene
B. DDT
C. Feron
D. Hexa chloro ethane

Answer

To determine the compound formed when chlorobenzene is heated with chloral in the presence of concentrated sulfuric acid, we can follow these steps:

### Step 1: Identify the Reactants
The reactants in this reaction are chlorobenzene (C6H5Cl) and chloral (CCl3CHO). Chloral is an aldehyde with three chlorine atoms attached to the carbon.

### Step 2: Understand the Role of Concentrated Sulfuric Acid
Concentrated sulfuric acid acts as a catalyst in this reaction. It provides a proton (H⁺) which helps in the formation of an electrophile from chloral. The electrophile will then react with chlorobenzene.

### Step 3: Formation of the Electrophile
When chloral is treated with concentrated sulfuric acid, the hydroxyl group (–OH) of chloral gets protonated, making it a better leaving group. This results in the formation of a carbonyl compound that can act as an electrophile.

### Step 4: Electrophilic Attack on Chlorobenzene
The electrophile generated from chloral will attack the para position of chlorobenzene. This is due to the stability of the intermediate formed during the reaction. The structure after the electrophilic attack will have two chlorines attached to the benzene ring and one hydroxyl group.

### Step 5: Formation of the Intermediate
After the electrophilic attack, we get an intermediate compound that has a hydroxyl group and two chlorines attached to the benzene ring. This intermediate can lose a molecule of water (dehydration) in the presence of sulfuric acid.

### Step 6: Final Product Formation
The final product formed after the loss of water is DDT (Dichlorodiphenyltrichloroethane). The structure of DDT has two benzene rings, each with two chlorine atoms attached.

### Conclusion
The compound formed on heating chlorobenzene with chloral in the presence of concentrated sulfuric acid is **Dichlorodiphenyltrichloroethane (DDT)**.

### Answer
**B) DDT (Dichlorodiphenyltrichloroethane)**

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