For the Hunsdiecker decarboxylation reaction, which of the following is false :

Options

A. It involves reaction between silver salt of an acid and `Br_2`.
B. It is used to prepare alkyl bromide.
C. It of the type :
`RCH_2 COO Ag + Br_2 rarr RCH_2 Br + CO_2 + AgBr`
D. It is of the type :
`RCH_2 COO Ag rarr RCH_3 + CO_2 + AgBr`.

Answer

To solve the question regarding the Hunsdiecker decarboxylation reaction and identify which statement is false, we will follow these steps:

### Step 1: Understand the Hunsdiecker Decarboxylation Reaction
The Hunsdiecker reaction involves the decarboxylation of silver salts of carboxylic acids, particularly oxalic acid. In this reaction, the silver salt reacts with bromine (Br2) to produce an alkyl halide and carbon dioxide (CO2).

### Step 2: Identify the Products of the Reaction
During the Hunsdiecker reaction, the silver salt of a carboxylic acid reacts with bromine, resulting in the loss of carbon dioxide (CO2) and the formation of an alkyl halide (specifically, an alkyl bromide) with one less carbon atom than the original carboxylic acid.

### Step 3: Analyze the Given Statements
We need to evaluate the provided statements about the Hunsdiecker reaction to find the false one. The statements generally include:
1. It involves a reaction between silver salt and bromine.
2. It is used to prepare alkyl bromides.
3. It is a type of decarboxylation reaction.
4. It produces alkanes.

### Step 4: Determine the Truth of Each Statement
- **Statement 1**: True. The reaction does involve silver salts and bromine.
- **Statement 2**: True. The reaction is indeed used to prepare alkyl bromides.
- **Statement 3**: True. It is classified as a decarboxylation reaction.
- **Statement 4**: False. The reaction produces alkyl bromides, not alkanes.

### Step 5: Conclusion
The false statement among the options provided is that the Hunsdiecker reaction produces alkanes. Therefore, the answer is option D.

### Final Answer
The false statement is option D.

---