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The –OH group of an alcohol or the –COOH group of a carboxylic acid can be replaced by –Cl using

1. Phosphorus pentachloride
2. Hypochlorous acid
3. Chlorine
4. Hydrochloric acid

Correct answer: Phosphorus pentachloride

Solution

Phosphorus pentachloride (PCl5) is commonly used to replace the –OH group in alcohols or carboxylic acids with a –Cl group, forming alkyl or acyl chlorides.

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