Which one of the following methods is used to prepare acid anhydride?
Correct answer: A. Dehydration of carboxylic acid with P2O5
- A. Dehydration of carboxylic acid with P2O5
- B. Reaction of carboxylic acid with SOCl2
- C. Reaction of carboxylic acid with NH3
- D. Reaction of carboxylic acid with alcohol in the presence of cone. H2SO4
Explanation
Option A is correct.Acid anhydrides can be prepared by the dehydration of two carboxylic acids in the presence of a dehydrating agent. A common dehydrating agent is phosphorus pentoxide (P2O5). The dehydration reaction is shown below: 2CH3COOH -> (CH3CO)2O + H2O In this reaction, two molecules of acetic acid (CH3COOH) are dehydrated to form acetic anhydride (CH3CO)2O. The water molecule (H2O) is produced as a byproduct.
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