Poisonous organic compound present in denatured rectified spirit is

Options

A. ethyl alcohol
B. methyl alcohol
C. ethanolo acid
D. formic acid

Explanation

**Step-by-Step Solution:**

1. **Understanding Denatured Rectified Spirit**: Denatured rectified spirit is a form of ethanol that has been made unfit for human consumption by the addition of toxic substances. This is done to avoid taxes and regulations that apply to consumable alcohol.

2. **Identifying the Components**: Denatured rectified spirit typically contains about 95% ethyl alcohol (ethanol) and 5% water. However, it also includes a poisonous organic compound to deter consumption.

3. **Recognizing the Poisonous Compound**: Among the options provided (Ethyl alcohol, Methyl alcohol, Aethenolol acid, Formic acid), we need to identify which one is a poisonous organic compound commonly added to denatured alcohol.

4. **Analyzing the Options**:
- **Ethyl alcohol**: This is the main component of the spirit, but it is not the poisonous additive.
- **Methyl alcohol (Methanol)**: This is a toxic alcohol that is often added to denatured spirits to make them undrinkable.
- **Aethenolol acid**: This is not a commonly recognized compound in this context.
- **Formic acid**: While it is an organic acid, it is not typically used as a denaturant.

5. **Conclusion**: The correct answer is **Methyl alcohol** (Methanol), as it is the poisonous organic compound present in denatured rectified spirit.

**Final Answer**: Methyl alcohol

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