Which of the following reagent will convert glycerol to acrolein ?

Options

A. `P_(2) O_(5)`
B. Conc . `H_(2) SO_(4)`
C. `KHSO_(4)`
D. All of these

Answer

To convert glycerol to acrolein, we can follow these steps:

### Step-by-Step Solution:

1. **Identify Glycerol Structure**:
Glycerol, also known as glycerin, has the chemical structure C3H8O3. Its structural formula is:
\[ \text{HO-CH}_2\text{-CHOH-CH}_2\text{-OH} \]

2. **Reagents for Dehydration**:
To convert glycerol to acrolein, we need to use a dehydrating agent. The common reagents that can facilitate this dehydration are:
- Potassium bisulfate (KHSO4)
- Concentrated sulfuric acid (H2SO4)
- Phosphorus pentoxide (P2O5)

3. **Dehydration Reaction**:
When glycerol is heated with any of these dehydrating agents, a dehydration reaction occurs. This means that water (H2O) is removed from the glycerol molecule. The reaction can be represented as:
\[ \text{C}_3\text{H}_8\text{O}_3 \rightarrow \text{C}_3\text{H}_4\text{O} + \text{H}_2\text{O} \]
Here, acrolein (C3H4O) is formed.

4. **Formation of Acrolein**:
The dehydration leads to the formation of an unstable intermediate which undergoes tautomerism. The final product is acrolein, which has the structure:
\[ \text{CH}_2=\text{CH}-\text{CHO} \]

5. **Conclusion**:
Therefore, the reagents that can convert glycerol to acrolein are potassium bisulfate (KHSO4), concentrated sulfuric acid (H2SO4), and phosphorus pentoxide (P2O5).

### Final Answer:
The correct reagents that will convert glycerol to acrolein are **KHSO4, concentrated H2SO4, and P2O5**.