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Question

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


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Solution

Dehydration of Malonic Acid

  1. Malonic Acid (CH2(COOH)2) on reaction with Phosphorous pentaoxide (P4O10) gives Pyrophosphoric acid (H4P2O7) and tri carbon-di-oxide (C3O2).
  2. Chemical Equation: 2CH2COOH(l)MalonicAcid+P4O10(g)PhosphorousPentaoxide2H4P2O7(l)PyrophosphoricAcid+2C3O2(g)CarbonSuboxide
  3. Carbon Suboxide is a symmetrical and linear molecule and that's a stable member of oxo-carbon family.
  4. It is written as: O=C=C=C=O called as Carbon Suboxide.

Hence on the Dehydration of Malonic acid, it gives Carbon Suboxide (C3O2).


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