Which of the following is incorrect for `H_(3)BO_(3)`

Options

A. It has a layer structre in which `H_(3)BO_(3)` units are joined by hydrogen bonds
B. It is obtained by treating borax with conc. `H_(2)SO_(4)`
C. It does not act as a proton donor but acts as an lewis acid by accepting hydroxyl ions.
D. None of these

Answer

To determine which statement about \( H_3BO_3 \) (boric acid) is incorrect, we will analyze each of the provided statements step by step.

### Step 1: Analyze the first statement
**Statement 1:** "It has a layered structure in which \( H_3BO_3 \) units are joined by hydrogen bonds."

- Boric acid does indeed have a layered structure. The \( BO_3 \) units are arranged in layers and are held together by hydrogen bonds. This statement is **correct**.

### Step 2: Analyze the second statement
**Statement 2:** "It is obtained by treating borax with concentrated \( H_2SO_4 \)."

- Boric acid can be synthesized by treating borax (sodium tetraborate) with sulfuric acid. The reaction is:
\[ Na_2B_4O_7 + H_2SO_4 + 5H_2O \rightarrow 4H_3BO_3 + Na_2SO_4 \]
- This statement is also **correct**.

### Step 3: Analyze the third statement
**Statement 3:** "It does not act as a proton donor but acts as a Lewis acid by accepting hydroxyl ions."

- Boric acid is known for its behavior as a Lewis acid. It does not donate protons (H⁺) in the same way that typical acids do; instead, it accepts hydroxyl ions (OH⁻) from water, forming \( B(OH)_4^- \) and \( H_3O^+ \). This statement is also **correct**.

### Step 4: Analyze the fourth statement
**Statement 4:** "None of this."

- Since we have established that all the previous statements are correct, this statement implies that there is no incorrect statement among the options provided.

### Conclusion
Since all the first three statements are correct, the answer to the question is that the fourth option, "none of this," is the correct choice.

### Final Answer
The answer is: **None of this (Option 4)**.

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