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 determine the correct statement among the options provided, we will analyze each statement one by one.

### Step 1: Analyze the first statement
**Statement:** Boric acid is a protonic acid.

- **Analysis:** Boric acid (H3BO3) is not a typical protonic acid. Instead, it acts as a Lewis acid by accepting hydroxide ions (OH-) from water, which leads to the formation of the tetrahydroxyborate ion (BOH4-) and hydronium ion (H3O+). Therefore, this statement is incorrect.

### Step 2: Analyze the second statement
**Statement:** Both Tl^3+ and Al^3+ ions act as oxidizing agents in solution.

- **Analysis:** While both Tl^3+ and Al^3+ can act as oxidizing agents, the statement is misleading due to the inert pair effect. Al^3+ is more stable and does not readily act as an oxidizing agent compared to Tl^3+. Therefore, this statement is also incorrect.

### Step 3: Analyze the third statement
**Statement:** Hydrogen bonding in H3BO3 gives it a layered structure.

- **Analysis:** This statement is correct. Hydrogen bonding in boric acid contributes to its layered structure, which is a characteristic feature of its molecular arrangement. The presence of hydrogen bonds between the molecules leads to this unique structure.

### Step 4: Analyze the fourth statement
**Statement:** B(OC2H5)3 imparts blue color to the burner flame.

- **Analysis:** B(OC2H5)3 (triethyl borate) does not impart a blue color to the flame. Instead, it is known for producing a green flame due to the presence of boron. Therefore, this statement is incorrect.

### Conclusion
After analyzing all the statements, the correct statement is:
**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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