In order to make alcohol undrinkable pyridine and methanol are added to it. The resulting alcohol is called:

Options

A. Power alcohol
B. Proof spirit
C. Denatured spirit
D. Poison alcohol

Answer

To solve the question, we need to identify the term used for alcohol that has been made undrinkable by the addition of certain substances, specifically pyridine and methanol. Here’s a step-by-step breakdown of the solution:

### Step 1: Understanding the Purpose of Adding Pyridine and Methanol
- Pyridine and methanol are added to alcohol to make it undrinkable. This is done to prevent the consumption of industrial alcohol, which is often cheaper than potable alcohol.

**Hint:** Consider why substances are added to make something undrinkable.

### Step 2: Identifying the Resulting Alcohol
- The resulting alcohol after the addition of pyridine and methanol is known as "denatured spirit." This term refers to alcohol that has been rendered unsuitable for drinking.

**Hint:** Think about the terminology used in chemistry for alcohol that has been altered for safety or regulatory reasons.

### Step 3: Recognizing Other Names
- Denatured spirit is also known by other names such as methylated spirit, wood spirit, and denatured rectified spirit. These names indicate various uses and compositions but all refer to the same concept of undrinkable alcohol.

**Hint:** Look for synonyms or alternative names commonly used in chemistry for denatured alcohol.

### Step 4: Applications of Denatured Spirit
- Denatured spirit is used for various industrial purposes, including as a fuel for alcohol burners. This highlights its utility despite being made undrinkable.

**Hint:** Consider the practical applications of substances in industrial settings.

### Conclusion
The correct answer to the question is that the resulting alcohol, after the addition of pyridine and methanol, is called **denatured spirit**.

**Final Answer:** Denatured spirit