SSC
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which conditions are required to obtain a good yield of a carboxylic acid when ethanol is oxidized using potassium dichromate(VI), K2Cr2O7(aq)?I. Add sulfuric acidII. Heat the reaction mixture under refluxIII. Distill the product as the oxidizing agent is added
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I and II only
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II and III only
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I and III only
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I, II and III
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Explanation:
Detailed explanation-1: -Thus, when Ethanol reacts with acidified Potassium dichromate, Ethanoic acid is formed.
Detailed explanation-2: -Ethyl alcohol on oxidation with acidified K2Cr2O7 gives CH3COOH.
Detailed explanation-3: -Alcohols can be oxidised by a warm solution of potassium dichromate (VII) (K2Cr2O7) mixed with dilute sulfuric acid. As the alcohol gets oxidised, the C2O7-2 ions in solution become reduced to Cr3+ ions. This causes the solution to change colour from orange to green.
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