Assertion (A): Solution of `AICI_(3)` in water is neutral.
Reason (R) : `[AI(H_(2)O)_(6)]^(3+)` is formed.

Options

A. If both (A) and (R) are correc, and (R) is the correct explanation of (A).
B. If both (A) and (R) are correct but (R) is not the correct explanation of (A).
C. If (A) is correct, but (R) is incorrect.
D. If (A) is incorrect, but (R) is correct.

Explanation

To solve the question regarding the assertion and reason about the solution of aluminum chloride (AlCl₃) in water, we will analyze both the assertion and the reason step by step.

### Step 1: Understanding the Assertion
The assertion states that the solution of AlCl₃ in water is neutral. To evaluate this, we need to consider what happens when AlCl₃ is dissolved in water.

### Step 2: Hydrolysis of AlCl₃
When AlCl₃ is dissolved in water, it undergoes hydrolysis. The aluminum ion (Al³⁺) interacts with water molecules to form a complex ion:
\[ [Al(H_2O)_6]^{3+} \]
This complex ion is formed as the aluminum ion attracts water molecules due to its positive charge.

### Step 3: Formation of Hydrochloric Acid
The chloride ions (Cl⁻) released from AlCl₃ do not significantly affect the pH of the solution. However, the complex ion [Al(H₂O)₆]³⁺ can release protons (H⁺) into the solution, leading to the formation of hydrochloric acid (HCl):
\[ [Al(H_2O)_6]^{3+} \rightarrow [Al(H_2O)_5(OH)]^{2+} + H^+ \]

### Step 4: Conclusion about the pH of the Solution
The release of H⁺ ions indicates that the solution becomes acidic rather than neutral. Therefore, the assertion that the solution of AlCl₃ in water is neutral is **false**.

### Step 5: Evaluating the Reason
The reason states that the complex ion [Al(H₂O)₆]³⁺ is formed. This statement is **true** as we have established that this complex does form when AlCl₃ is dissolved in water.

### Final Conclusion
- **Assertion (A)**: False (the solution is acidic, not neutral).
- **Reason (R)**: True (the complex ion [Al(H₂O)₆]³⁺ is indeed formed).

Thus, the correct answer is that the assertion is incorrect, and the reason is correct.