How will you prepare from propene Allyl iodide.

Explanation

To prepare allyl iodide from propene, we can follow these steps:

### Step 1: Chlorination of Propene
1. **Starting Material**: Begin with propene (CH3CH=CH2).
2. **Reagent**: Treat propene with chlorine (Cl2) in the presence of a solvent like carbon tetrachloride (CCl4) or another suitable non-polar solvent.
3. **Reaction**: The chlorine will add across the double bond, and one of the chlorine atoms will replace one of the hydrogen atoms on the first carbon (alpha position).
4. **Product Formation**: The product formed is 3-chloropropene (CH2Cl-CH=CH2).

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