Ethanol is made unfit for drinking by adding

Options

A. propanol
B. methanal
C. methanol
D. ethanal

Explanation

To solve the question "Ethanol is made unfit for drinking by adding," we can follow these steps:

### Step 1: Understand what ethanol is
Ethanol is a type of alcohol with the chemical formula C2H5OH, commonly known as drinking alcohol or ethyl alcohol.

**Hint:** Remember that ethanol is the alcohol found in beverages, and its chemical structure is important for understanding its properties.

### Step 2: Identify substances that can make ethanol unfit for drinking
To make ethanol unfit for consumption, certain harmful substances can be added. One well-known substance is methanol, which has the chemical formula CH3OH.

**Hint:** Consider the properties of different alcohols and their effects on health. Methanol is known for being toxic.

### Step 3: Analyze the effects of adding methanol
When methanol is added to ethanol, it creates a mixture that is dangerous to consume. Methanol is highly poisonous and can cause serious health issues, including blindness and even death if ingested.

**Hint:** Think about the toxicity of methanol compared to ethanol and why it would be used to deter consumption.

### Step 4: Conclusion
Therefore, ethanol is made unfit for drinking by adding methanol (CH3OH). This addition makes the ethanol mixture toxic and unsafe for human consumption.

**Final Answer:** Ethanol is made unfit for drinking by adding methanol.