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 conc. H2SO4
Explanation
Acid anhydride is prepared when carboxylic acids are dehydrated on heating strongly in the presence of phosphorus pentoxide P2O5 .
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About Carboxylic Acids
Carboxylic acids are named and studied through the combined effects of the carbonyl and hydroxyl groups, their preparation, acidity and hydrogen bonding. Reactions include neutralisation, esterification, reduction and conversion into acid chlorides, anhydrides, esters and amides, with emphasis on how these derivatives interconvert.
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