Which of these cannot decolourise the color of acidified potassium permanganate?
Correct answer: C. Ethanoic acid
- A. Acetaldehyde
- B. Acetone
- C. Ethanoic acid
- D. Ethanol
Explanation
Ethanoic acid contains a carboxyl group. The carbon atom in the carboxyl group is already at its highest oxidation state, therefore, it cannot be oxidised any further. As acidified KMnO4 cannot act as an oxidising agent here, it does not decolourise.
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About Aldehydes and Ketones
Aldehydes and ketones contain the polar carbonyl group, but aldehydes are generally more readily oxidised and more reactive than ketones. Coverage includes preparation by oxidation or reduction routes, nucleophilic addition of reagents such as hydrogen cyanide and bisulfite, and tests that distinguish aldehydes from ketones.
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