Which dicarboxylic acid in presence of a dehydrating agent is least reactive to give an anhydride?
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The Correct Option is A
Solution and Explanation
Option (2) phthalic acid gives a 5-membered cyclic anhydride (phthalic anhydride) readily.
Option (3) succinic acid \(\mathrm{HOOC-CH_2-CH_2-COOH}\) gives a 5-membered anhydride (succinic anhydride).
Option (4) cyclopentane-1,2-dicarboxylic acid (adjacent groups) gives a fused 5-membered anhydride.
So the acid least reactive towards anhydride formation is adipic acid.
Answer: (1) the open-chain hexanedioic (adipic) acid
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