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Give in the product by carboxylic acid method with examples ? |
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Answer» Solution :* Sodium salts of carboxylic acids on heating with soda lime (mixture of sodium hydroxide and calcium atom LESS than the carboxylic acid. This process of elimination of carbon DIOXIDE from a caroxylic acid is known as decarboxylation. `underset("Acid")(RCOOH)underset(+3 NaOH, -H_(2)O,-Na_(2)CO_(3))overset("Soda lime", Delta)rarr underset("Hydrocarbon")(RH)` * Soda lime is a mixture of sodium hydroxide (NaOH) and calcium OXIDE (CaO). NaOH of soda lime reacts with acid and forms sodium salt of acid. Example -1 : Methane from acetic acid. `underset("Sodium ethanoate")(CH_(3)COO Na^(1))+NaOH underset(Delta)overset(CaO)rarr underset("Methane")(CH_(4))+Na_(2)CO_(3)` Here, formation of sodium ethanote is from acetic acid. Example -2 : Ethane from propanoic acid. `underset("Propanoic acid")(CH_(3)CH_(2)COOH)underset((NaOH//CaO)Delta)overset("Soda lime")rarr underset("Sodium ethanoate")([C_(2)H_(5)COONa^(+)])overset(Delta)rarr underset("Ethane")(C_(2)H_(6))` NOte : In decarboxylation process, `CO_(2)` is liberated and we get product of 1 carbon less. These reaction is useful when we get 1 carbon less in out product. |
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