Which metal is used in the preparation of Grignard's reagent from haloalkanes ?

Explanation

**Step-by-Step Text Solution:**

1. **Understanding Grignard Reagent**: Grignard reagents are organomagnesium compounds that are formed by the reaction of haloalkanes with magnesium metal. They are highly reactive and are used in various organic synthesis reactions.

2. **Identifying the Metal**: The metal used in the preparation of Grignard's reagent is magnesium (Mg).

3. **Reaction Process**: When a haloalkane (like methyl bromide, CH3Br) is treated with magnesium, the magnesium inserts itself between the carbon atom and the halogen atom (in this case, bromine).

...