Which of the following statements is not correct about methanol ?

Options

A. It is used for drinking purposes .
B. It is highly poisonous compound .
C. It can be prepared by reduction of formaldehyde with `LiAlH_4`
D. It is miscible with water in all proportions .

Explanation

To determine which statement about methanol is not correct, let's analyze each of the given options step by step.

### Step 1: Analyze the first statement
**Statement:** Methanol is used for drinking purposes.

**Analysis:** Methanol (CH₃OH) is highly toxic and can cause serious health issues or death if ingested. It is not safe for consumption and is not used for drinking purposes.

**Conclusion:** This statement is incorrect.

### Step 2: Analyze the second statement
**Statement:** Methanol is a highly poisonous compound.

**Analysis:** Methanol is indeed highly poisonous. Ingestion of methanol can lead to methanol poisoning, which can cause metabolic acidosis, visual disturbances, and even death.

**Conclusion:** This statement is correct.

### Step 3: Analyze the third statement
**Statement:** Methanol can be prepared by the reduction of formaldehyde with LiAlH₄.

**Analysis:** Methanol can be synthesized from formaldehyde (HCHO) through a reduction reaction using lithium aluminum hydride (LiAlH₄). The reaction is as follows:
\[ \text{HCHO} + \text{LiAlH}_4 \rightarrow \text{CH}_3\text{OH} \]

**Conclusion:** This statement is correct.

### Step 4: Analyze the fourth statement
**Statement:** Methanol is miscible with water in all proportions.

**Analysis:** Methanol is polar and can form hydrogen bonds with water molecules, making it miscible with water in all proportions.

**Conclusion:** This statement is correct.

### Final Conclusion
After analyzing all the statements, the statement that is not correct about methanol is:
**Methanol is used for drinking purposes.**