Maximum number of active hydrogen are present in

Options

A. ethanoic acid
B. ethyne
C. methanol
D. glycerol

Answer

To determine the maximum number of active hydrogens present in the given compounds, we first need to understand what is meant by "active hydrogen." Active hydrogen refers to hydrogen atoms that are attached to highly electronegative atoms, such as oxygen or nitrogen, making them more reactive.

### Step-by-Step Solution:

1. **Identify the Compounds**: The compounds we need to analyze are:
- Ethanoic acid (CH₃COOH)
- Ethyne (C₂H₂)
- Methanol (CH₃OH)
- Glycerol (C₃H₈O₃)

2. **Analyze Ethanoic Acid (CH₃COOH)**:
- In ethanoic acid, there is one hydrogen atom attached to the oxygen atom in the carboxylic group (-COOH).
- Therefore, the number of active hydrogens in ethanoic acid is **1**.

3. **Analyze Ethyne (C₂H₂)**:
- Ethyne has the structure CH≡CH, which contains no hydrogen atoms attached to electronegative atoms.
- Therefore, the number of active hydrogens in ethyne is **0**.

4. **Analyze Methanol (CH₃OH)**:
- In methanol, there is one hydrogen atom attached to the oxygen atom in the hydroxyl group (-OH).
- Therefore, the number of active hydrogens in methanol is **1**.

5. **Analyze Glycerol (C₃H₈O₃)**:
- Glycerol has the structure CH₂OH-CHOH-CH₂OH.
- There are three hydroxyl groups (-OH), and each contributes one active hydrogen.
- Therefore, the number of active hydrogens in glycerol is **3**.

6. **Conclusion**:
- After analyzing all the compounds, we find:
- Ethanoic acid: 1 active hydrogen
- Ethyne: 0 active hydrogens
- Methanol: 1 active hydrogen
- Glycerol: 3 active hydrogens
- The compound with the maximum number of active hydrogens is **glycerol**, with a total of **3 active hydrogens**.

### Final Answer:
The correct option is **glycerol**, which has the maximum number of active hydrogens (3).