Which of the following compounds can be used as antifreeze in automobile radiators?

Options

A. Methyl alcohol
B. Glycol
C. Nitrophenol
D. Ethyl alcohol

Answer

To determine which compound can be used as antifreeze in automobile radiators, we need to analyze the given options:

1. **Methyl Alcohol (Methanol)**
2. **Glycol (Ethylene Glycol)**
3. **Nitrophenol**
4. **Ethyl Alcohol (Ethanol)**

### Step 1: Understand the Purpose of Antifreeze
Antifreeze is a substance that lowers the freezing point of a liquid, preventing it from freezing in cold temperatures. This is crucial for automobile radiators to avoid engine damage due to freezing.

### Step 2: Analyze Each Compound
- **Methyl Alcohol (Methanol)**: While methanol can lower the freezing point of water, it is not commonly used as antifreeze in automobile radiators due to its toxicity and potential to cause damage to engine components.

- **Glycol (Ethylene Glycol)**: Ethylene glycol is widely used as antifreeze in automobile radiators. It effectively lowers the freezing point of water and raises the boiling point, preventing the engine from freezing and overheating. It also provides a wide range of temperatures in which the mixture remains in the liquid phase.

- **Nitrophenol**: This compound is not used as antifreeze. It is primarily used in the manufacture of dyes and as a reagent in organic synthesis.

- **Ethyl Alcohol (Ethanol)**: Although ethanol can lower the freezing point of water, it is not as effective as glycol for this purpose in automobile radiators. Moreover, it can be less effective in preventing corrosion and may not provide the necessary temperature range.

### Step 3: Conclusion
From the analysis, the compound that is specifically used as antifreeze in automobile radiators is **Glycol (Ethylene Glycol)**.

### Final Answer
**Glycol (Ethylene Glycol)** is the compound that can be used as antifreeze in automobile radiators.

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