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

Options

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

Explanation

To determine which compound can be used as antifreeze in automobile radiators, we will analyze the given options: glycol, nitrophenone, ethyl alcohol, and methyl alcohol.

### Step-by-Step Solution:

1. **Identify the Compounds:**
- Glycol: This typically refers to ethylene glycol (C2H6O2), which is a dihydric alcohol.
- Nitrophenone: This is an aromatic compound and is not commonly used as an antifreeze.
- Ethyl alcohol: Also known as ethanol (C2H5OH), it is a simple alcohol.
- Methyl alcohol: Also known as methanol (CH3OH), it is another simple alcohol.

2. **Evaluate the Properties of Each Compound:**
- **Glycol (Ethylene Glycol):**
- It has a much lower freezing point than water and can effectively lower the freezing point of water when mixed.
- It prevents the radiator from freezing and bursting in cold temperatures.
- **Nitrophenone:**
- This compound does not have properties suitable for antifreeze and is not used for this purpose.
- **Ethyl Alcohol (Ethanol):**
- While it can lower the freezing point, it is not as effective as ethylene glycol and can evaporate quickly.
- **Methyl Alcohol (Methanol):**
- It can also lower the freezing point but is toxic and not commonly used in automotive applications.

3. **Conclusion:**
- Among the options provided, **ethylene glycol** is the most suitable compound for use as antifreeze in automobile radiators due to its effective freezing point depression and lower specific heat compared to water.

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

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