When benzenediazonium chloride is heated with fluoro boric acid, fluorobenzene is formed. This reaction is called

Options

A. Balz Schiemann reation
B. Gattermann reaction
C. Sandmeyer reaction
D. Hoffmann bromamide reaction

Answer

To solve the question regarding the reaction of benzenediazonium chloride with fluoro boric acid, we can break down the process into clear steps:

### Step-by-Step Solution:

1. **Identify the Reactants**: The reactants in this reaction are benzenediazonium chloride (C6H5N2Cl) and fluoro boric acid (HBF4).

2. **Understand the Structure of Benzenediazonium Chloride**: Benzenediazonium chloride consists of a benzene ring (C6H5) attached to a diazonium group (N2+) and a chloride ion (Cl-). The diazonium group is a good leaving group.

3. **Reaction with Fluoro Boric Acid**: When benzenediazonium chloride is heated with fluoro boric acid, the diazonium group (N2) acts as a leaving group. The reaction can be summarized as:
\[ C_6H_5N_2Cl + HBF_4 \rightarrow C_6H_5F + N_2 + HCl \]
Here, the diazonium group (N2) leaves, and the fluorine from the fluoro boric acid replaces the diazonium group on the benzene ring.

4. **Formation of Fluorobenzene**: The product of this reaction is fluorobenzene (C6H5F), which is formed after the elimination of nitrogen gas (N2) and hydrochloric acid (HCl).

5. **Name of the Reaction**: This specific reaction is known as the **Bals-Skyman reaction**. It is a method for the synthesis of aryl fluorides from aryl diazonium salts.

### Final Answer:
The reaction of benzenediazonium chloride with fluoro boric acid to form fluorobenzene is called the **Bals-Skyman reaction**.

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