Malonic acid on dehydration with $P_{4} O_{10}$ gives an oxide, which is ___________

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Solution

Dehydration of Malonic Acid
Malonic Acid ( ${CH}_{2} {(COOH)}_{2}$ ) on reaction with Phosphorous pentaoxide ( $P_{4} O_{10}$ ) gives Pyrophosphoric acid ( $H_{4} P_{2} O_{7}$ ) and tri carbon-di-oxide ( $C_{3} O_{2}$ ).
Chemical Equation: $\underset{Malonic Acid}{2 {CH}_{2} COOH (l)} + \underset{P h o s p h o r o u s P e n t a o x i d e}{P_{4} O_{10} (g)} \to \underset{Pyrophosphoric Acid}{2 H_{4} P_{2} O_{7} (l)} + \underset{Carbon Suboxide}{2 C_{3} O_{2} (g)}$
Carbon Suboxide is a symmetrical and linear molecule and that's a stable member of oxo-carbon family.
It is written as: $O = C = C = C = O$ called as Carbon Suboxide.
Hence on the Dehydration of Malonic acid, it gives Carbon Suboxide $(C_{3} O_{2})$ .

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Malonic acid on dehydration with P4O10gives an oxide, which is ___________

Malonic acid on dehydration with $P_{4} O_{10}$ gives an oxide, which is ___________