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JEE Main levelSingle correct optionDifficulty 2 of 3si260

The compound shown gives a silver mirror with Tollens' reagent but no red precipitate with Fehling's solution. Which of the structures shown gives a red precipitate of with Fehling's solution?

  1. AStructure A
  2. BStructure B
  3. CStructure C
  4. DStructure D

Answer: B

Fehling's solution oxidises aliphatic aldehydes but not aromatic aldehydes. B (propanal) gives the red precipitate. A (4-methylbenzaldehyde) is aromatic, and C and D are ketones.
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