Hunsdiecker reaction is used to prepare alkyl chloride and alkyl bromide starting from

Options

A. Diazonium salt
B. Silver salt of carboxylic acids
C. Sodium salt of carboxylic acids
D. Alcohols

Answer

### Step-by-Step Solution:

1. **Understanding the Hunsdiecker Reaction**:
The Hunsdiecker reaction is a chemical reaction that involves the conversion of silver salts of carboxylic acids into alkyl halides (either alkyl chlorides or alkyl bromides) when treated with halogens (X2) in the presence of carbon tetrachloride (CCl4).

2. **Identifying the Starting Material**:
In the Hunsdiecker reaction, the starting material is the silver salt of a carboxylic acid. This can be represented as RCOOAg, where R is an alkyl group.

3. **Reaction Conditions**:
The silver salt of the carboxylic acid is treated with a halogen (X2), which can be either chlorine (Cl2) or bromine (Br2). The reaction is typically carried out in carbon tetrachloride (CCl4) under reflux conditions.

4. **Products of the Reaction**:
When the silver salt reacts with the halogen, it produces an alkyl halide (RX) and silver halide (AgX), along with carbon dioxide (CO2) as a byproduct. The specific alkyl halide formed depends on the halogen used:
- If Cl2 is used, the product is an alkyl chloride (RCl).
- If Br2 is used, the product is an alkyl bromide (RBr).

5. **Conclusion**:
Based on the above understanding, the correct answer to the question is option B: Silver Salt of Carboxylic Acids.

### Final Answer:
**B. Silver Salt of Carboxylic Acids**