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Why does adipic acid give cyclic ketone on heating while glutaric and succinic acid give cyclic anhydride?
According to Blanc Rule for Dibasic Carboxylic acids, A cyclic Ketone is formed unless a five or six membered cyclic acid anhydride can be formed. This rule is valid for 1,4; 1,5; 1,6. dicarboxylic acids
Because cyclic anhydride formed will be a 7 Member ring compound which is less stable than 5 membered cyclic ketone
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