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Question

An organic compound A of molecular formula C2H6O is a constituent of wine and beer. This compound on heating with alkaline potassium permanganate forms another organic compound B which turns blue litmus to red. Identify the compounds A and B.

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Solution

An organic compound A of molecular formula C2H6O is a constituent of wine and beer, so it must be an alcohol containing molecule, i.e. ethanol (CH3CH2OH).

When ethanol is treated with alkaline potassium permanganate, it oxidizes ethanol and forms compound "B" which is ethanoic acid.

C2H5OH+KMnO4alkalineCH3COOH+H2O

Due to the formation of ethanoic acid, blue litmus turns red.

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