Which one of the following is used as an anti-freeze for the automobile engines ? A. Propyl alcohol B. Ethanol C. Methanol D. Ethylene glycol

Propyl alcohol
Ethanol
Methanol
Ethylene glycol

Ethylene glycol is the most common type of antifreeze used in automobile engines. It is a colorless, odorless liquid that is miscible with water. Ethylene glycol is a good antifreeze because it has a high boiling point and a low freezing point. It also has a high heat capacity, which means that it can absorb a lot of heat without changing temperature. This helps to keep the engine from overheating.

Propyl alcohol is another type of antifreeze that is sometimes used in automobile engines. It is a colorless, flammable liquid that is miscible with water. Propyl alcohol is not as effective as ethylene glycol at preventing freezing, but it is less toxic.

Ethanol is a type of alcohol that is produced from fermentation. It is a colorless, flammable liquid that is miscible with water. Ethanol is not as effective as ethylene glycol at preventing freezing, but it is less toxic and biodegradable.

Methanol is a type of alcohol that is produced from natural gas or coal. It is a colorless, flammable liquid that

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is miscible with water. Methanol is the most toxic of the four types of alcohol, and it can be fatal if ingested.

Therefore, the correct answer to the question is:

D. Ethylene glycol

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