Outline the synthesis of propyne from isopropyl or propyl bromide. The neede vicdiholide is formed from propene, which is prepared from the alkyl halides.

Explanation

To synthesize propyne from isopropyl or propyl bromide, we will follow a series of reactions. Here’s a step-by-step outline of the synthesis process:

### Step 1: Preparation of Propene from Propyl Bromide
1. **Starting Material**: Begin with propyl bromide (CH3CH2CH2Br).
2. **Dehydrohalogenation**: Treat propyl bromide with alcoholic KOH (potassium hydroxide).
- KOH will abstract a beta hydrogen from the propyl bromide, leading to the elimination of HBr and forming propene (CH3CH=CH2).
- The reaction can be represented as:
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