What is the action of Mg in benzene on acetone ?

Explanation

To understand the action of magnesium (Mg) in benzene on acetone, we can break down the reaction into several steps:

### Step 1: Understanding the Reactants
- Acetone (C₃H₆O) is a ketone with the structure CH₃COCH₃.
- Magnesium (Mg) is a metal that can react with certain organic compounds in the presence of solvents like benzene.

### Step 2: Formation of Grignard Reagent
- When magnesium is added to acetone in benzene, it forms a Grignard reagent.
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