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Q. Which dicarboxylic acid in presence of a dehydrating agent is least reactive to give an anhydride :

JEE MainJEE Main 2019Aldehydes Ketones and Carboxylic Acids

Solution:

Adipic acid $ CO_2H-(CH_2)_4-CO_2H \xrightarrow[\text{agent}]{\text{dehydrating}}$ 7 membered cyclic anhydride (Very unstable)