The reaction `Aroverset(+)N_(2)Cl^(-) overset(Cu//HCl)to ArCl +N_(2) + CuCl ` is named as _____

Options

A. Sandmeyer reaction
B. Gatterman reaction
C. Hofmann bromamie degradation reaction
D. Carbylamine reaction

Answer

To determine the name of the reaction given by the equation:

\[ \text{ArN}_2\text{Cl} \xrightarrow{\text{Cu/HCl}} \text{ArCl} + \text{N}_2 + \text{CuCl} \]

we will analyze the components involved in the reaction and identify the correct reaction name.

### Step 1: Identify the Reactants
The reactant in the given reaction is benzene diazonium chloride, represented as \(\text{ArN}_2\text{Cl}\). This is a key component in several reactions involving diazonium compounds.

**Hint:** Look for the specific structure of the reactant to identify the type of reaction.

### Step 2: Identify the Products
The products of the reaction are chlorobenzene (\(\text{ArCl}\)), nitrogen gas (\(\text{N}_2\)), and copper(I) chloride (\(\text{CuCl}\)). The formation of nitrogen gas is a common feature in reactions involving diazonium salts.

**Hint:** Check if the products are consistent with known reactions involving diazonium compounds.

### Step 3: Compare with Known Reactions
We need to compare this reaction with known reactions involving diazonium salts:
- **Sandmeyer Reaction:** Involves the conversion of diazonium salts to aryl halides using copper(I) halides (like CuCl) and HCl.
- **Gatterman Reaction:** Similar to Sandmeyer but typically uses copper powder and HCl.
- **Hofmann Bromamide Degradation Reaction:** Involves amides, not diazonium salts.
- **Carbamine Reaction:** Involves primary amines, not diazonium salts.

**Hint:** Identify which reactions utilize diazonium salts and which do not.

### Step 4: Determine the Correct Reaction
In this case, the reaction provided is similar to the Gatterman reaction, where benzene diazonium chloride reacts with copper in the presence of HCl to produce chlorobenzene, nitrogen gas, and copper(I) chloride. The key difference from the Sandmeyer reaction is the use of copper powder instead of copper(I) chloride.

**Hint:** Focus on the specific reagents used in the reaction to differentiate between similar reactions.

### Conclusion
The reaction given in the question is named the **Gatterman Reaction**.

**Final Answer:** Gatterman Reaction