Which of the following statement is correct for the given acids?

Options

A. Phosphinic acid is a monoprotic acid while phosphonic acid is a diprotic acid
B. Phosphinic acid is a diprotic acid while phosphonic acid is a monoprotic acid
C. Both are triprotic acids
D. Both are diprotic acids

Explanation

To determine which statement is correct regarding the given acids, we need to analyze the properties of phosphonic acid (H3PO3) and phosphinic acid (H3PO2).

### Step-by-Step Solution:

1. **Identify the Acids**:
- Phosphinic acid: H3PO2
- Phosphonic acid: H3PO3

2. **Determine the Number of Ionizable Hydrogens**:
- **Phosphinic Acid (H3PO2)**:
- Structure: It has one hydroxyl (–OH) group and two hydrogen atoms attached to phosphorus.
- The only acidic hydrogen is from the hydroxyl group, which can release one H⁺ ion.
- Thus, it is classified as a **monoprotic acid** (can donate one proton).

- **Phosphonic Acid (H3PO3)**:
- Structure: It has two hydroxyl (–OH) groups and one hydrogen atom attached to phosphorus.
- Both hydroxyl groups can release H⁺ ions, allowing it to donate two protons.
- Therefore, it is classified as a **diprotic acid** (can donate two protons).

3. **Conclusion**:
- Based on the analysis, the correct statement is that phosphinic acid is monoprotic and phosphonic acid is diprotic.

### Final Answer:
- The correct statement is: **Phosphinic acid is monoprotic while phosphonic acid is diprotic.**