The reaction conditions used for converting 1, 2- dibromopropane to propylene are

Options

A. KOH,alcohol`// Delta`
B. KOH, water `// Delta`
C. Zn, alcohol`// Delta`
D. Na, alcohol `//Delta`

Explanation

To convert 1,2-dibromopropane to propylene, we can follow these steps:

### Step 1: Identify the Structure of 1,2-Dibromopropane
1,2-Dibromopropane has the following structure:
- CH3-CHBr-CH2Br

### Step 2: Understand the Reaction
The goal is to eliminate the bromine atoms from the 1,2-dibromopropane to form propylene (CH3-CH=CH2). This is an elimination reaction where we will remove two bromine atoms.

### Step 3: Choose the Reagents
The typical reagents for this reaction are:
- Zinc (Zn)
- An alcohol (like ethanol or isopropanol)
- Heat

### Step 4: Write the Reaction
The reaction can be summarized as follows:
1,2-Dibromopropane + Zn + Alcohol (heat) → Propylene + ZnBr2 + HBr

### Step 5: Conditions for the Reaction
- **Zinc** acts as a reducing agent.
- **Alcohol** serves as a solvent and may help in the elimination process.
- **Heat** is required to drive the reaction forward and to facilitate the elimination of bromine.

### Final Reaction Condition
Thus, the reaction conditions used for converting 1,2-dibromopropane to propylene are:
- Zinc in the presence of alcohol and heat.