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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3co164

In which of the following pairs can the two compounds be distinguished by warming each with Fehling solution?

  1. Aethanal and benzaldehyde
  2. Bpropanal and propanone
  3. Cpentan-2-one and pentan-3-one
  4. Dphenyl methyl ketone and diphenyl ketone

Answer: A, B

Ethanal gives a red precipitate and benzaldehyde does not; propanal gives one and propanone does not. Both pentanones and both aromatic ketones are Fehling-negative, so those pairs are not distinguished.
Practice Aldehydes, Ketones and Carboxylic Acids More on Oxidation and reduction of carbonyls (Clemmensen, Wolff-Kishner, Tollens, Fehling)
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