Which one of the following is the correct statement?

Options

A. Boric acid is a protonic acid.
B. Both `Ti^(3+)` and `Al^(3+)` ions act as oxidising agent in aqueous solution.
C. Hydrogen bonding in `H_(3)BO_(3)` gives it a layered structure.
D. `B(Oet)_(3)`imparts blue colour to the burner flamer.

Answer

To solve the question, we need to evaluate each statement provided and determine which one is correct.

### Step-by-Step Solution:

1. **Evaluate the first statement: "Boric acid is a protonic acid."**
- Boric acid (H3BO3) does not behave as a protonic acid. Instead, it acts as a Lewis acid because it accepts hydroxide ions (OH⁻) from water rather than donating protons (H⁺). Therefore, this statement is **incorrect**.

2. **Evaluate the second statement: "Both Ti³⁺ and Al³⁺ act as oxidizing agents in aqueous solution."**
- Ti³⁺ can act as an oxidizing agent because it has vacant d-orbitals and can gain electrons. However, Al³⁺ has a stable electronic configuration (similar to neon) and does not act as an oxidizing agent. Thus, this statement is also **incorrect**.

3. **Evaluate the third statement: "Hydrogen bonding in H3BO3 gives it a layered structure."**
- In H3BO3, the presence of hydrogen bonding between the molecules contributes to a layered structure. This statement is **correct**.

4. **Evaluate the fourth statement: "B(OH)3 imparts blue color to the burner flame."**
- The correct statement is that B(OH)3 (boric acid) imparts a green color to the flame, not blue. Therefore, this statement is **incorrect**.

### Conclusion:
After evaluating all the statements, the only correct statement is the third one: "Hydrogen bonding in H3BO3 gives it a layered structure."

### Final Answer:
The correct statement is: **"Hydrogen bonding in H3BO3 gives it a layered structure."**

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