Which reaction is used for the preparation of `alpha`-Bromoacetic acid from acetic acid ?

Options

A. Kolbe's Reaction
B. Reimer-Tiemann Reaction
C. Hell volhard Zelinsky Reaction
D. Perkin's Reation

Explanation

To prepare alpha-Bromoacetic acid from acetic acid, we can use the Hell-Volhard-Zelinsky (HVZ) reaction. Here’s a step-by-step solution:

### Step 1: Identify the Reactants
We start with acetic acid (CH₃COOH), which contains an alpha hydrogen atom adjacent to the carboxylic acid group.

**Hint:** Look for the presence of alpha hydrogen in the molecule you are starting with.

### Step 2: Reaction with Bromine and Phosphorus
...