Starting from propene sythesize 1,1- dibromopropane.

Explanation

To synthesize 1,1-dibromopropane starting from propene, we can follow these steps:

### Step 1: Electrophilic Addition of Bromine
- **Reaction**: Propene (CH3-CH=CH2) reacts with bromine (Br2).
- **Mechanism**: The double bond in propene acts as a nucleophile and attacks one of the bromine atoms, forming a bromonium ion. The other bromine atom becomes a bromide ion (Br-).
- **Intermediate**: Bromonium ion is formed (CH3-CHBr-CH2+).

### Step 2: Nucleophilic Attack by Bromide Ion
...