See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

OH O O ; ; ; keto acid decarboxylates on simple heating  COOH O HOOC O C H3 C O CH2 COOH Geminal diacids also decarboxylates on heating COOH COOH ; H2C COOH COOH H2C CH CH2 C O OH , unsaturated acid decarboxylates simply on heating   1,,4 and 1,,5 diacid dehydrates on heating.  ; ; H2C H2C COOH COOH H2C CH2 CH2 COOH COOH Section – C