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Question

An organic compound A of molecular formula C2H6O on oxidation gives an acid B which gives effervescence with baking soda solution. What can compounds A and B be? Write their structures.


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Solution

  • Compound A must be an Alcohol, after the oxidation of Alcohol it converts to Carboxylic acid. When Carboxylic acid reacts with baking soda (Na2CO3), it gives effervescence. The molecular formula of compound A is C2H6O and must be Alcohol. So, compound A is Ethanol (CH3CH2OH).
  • The oxidation reaction of Ethanol with alkaline Potassium permanganate (KMnO4) solution gives Ethanoic acid (CH3COOH). The chemical equation of the reaction is written as:

CH3CH2OH→alk.KMnO4CH3COOH+H2O(Ethanol)(Ethanoicacid)(Water)(A)(B)

So, compound B is Ethanoic acid.

  • Ethanoic acid reacts with baking soda to form a salt that is Sodium acetate (CH3COONa) and Carbon dioxide (CO2) with effervescence.

The balanced chemical equation of the reaction is written as:

2CH3COOH+Na2CO3→2CH3COONa+CO2+H2O(Ethanoic(Sodium(Sodiumacetate)(Carbon(Water)acid)carbonate)dioxide)

Final answer:

Compound A is Ethanol (CH3CH2OH)and compound B is Ethanoic acid CH3COOH.


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