Which of the following derivatives cannot be prepared directly from carboxylic acid?
Correct answer: B. Acid amide
- A. Acid halide
- B. Acid amide
- C. Ester
- D. Acid anhydride
Explanation
The direct reaction of a carboxylic acid with ammonia results in an acid-base reaction, forming an ammonium carboxylate salt. This salt must then be heated to dehydrate it to form the acid amide. The other derivatives can be formed in a single step.
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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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