Ethanoic acid reacts with phosphorus pentachloride to give
Correct answer: A. ethanoyl chloride, hydrogen chloride and phosphorus oxychloride
- A. ethanoyl chloride, hydrogen chloride and phosphorus oxychloride
- B. chloroethane and water
- C. ethanol and chlorine
- D. ethanal only
Explanation
The hydroxyl group of the acid is replaced by chlorine, giving the far more reactive acyl chloride, and the misty fumes of hydrogen chloride released make this a useful test for a hydroxyl or carboxyl group. Thionyl chloride achieves the same conversion with gaseous by products that are easier to remove. The acyl chloride is then used to prepare esters and amides.
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About Carboxylic Acid Derivatives
Carboxylic acid derivatives include acid halides, acid anhydrides, esters and amides, formed by replacing the hydroxyl group of a carboxylic acid. Their nomenclature, structures, preparation, hydrolysis and relative reactivity are linked through nucleophilic acyl substitution, which differs from the nucleophilic addition reactions of aldehydes and ketones.
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550 free Carboxylic Acids MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
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