Propene may be obtained by the dehydration of

Options

A. ethyl alcohol
B. methyl alcohol
C. propyl alcohol
D. isopropyl alcohol

Answer

To obtain propene through dehydration, we need to start with an appropriate alcohol. The dehydration of alcohols involves the removal of a water molecule (H2O) from the alcohol, resulting in the formation of an alkene. Here’s a step-by-step solution to the question:

### Step-by-Step Solution:

1. **Identify the Alcohol**:
To produce propene (C3H6), we need to start with an alcohol that contains three carbon atoms. The suitable alcohol for this purpose is **1-propanol (C3H7OH)** or **2-propanol (isopropyl alcohol, C3H8O)**.

2. **Dehydration Reaction**:
The dehydration of alcohols typically requires an acid catalyst (like sulfuric acid, H2SO4). The reaction can be summarized as follows:
- For **1-propanol**:
\[ \text{C3H7OH} \xrightarrow{\text{H}^+} \text{C3H6} + \text{H2O} \]
- For **2-propanol**:
\[ \text{C3H8O} \xrightarrow{\text{H}^+} \text{C3H6} + \text{H2O} \]

3. **Mechanism of Dehydration**:
- When the alcohol is treated with an acid, the hydroxyl group (-OH) is protonated, forming a better leaving group (water).
- The water molecule then leaves, forming a carbocation intermediate.
- A hydrogen atom is then removed from an adjacent carbon atom, resulting in the formation of the double bond, yielding propene.

4. **Final Product**:
The final product of the dehydration of either 1-propanol or 2-propanol is **propene (C3H6)**.

### Conclusion:
Propene can be obtained by the dehydration of either **1-propanol or 2-propanol**.

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