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JEE Main · 2022 · 25 Jul 2022 · Shift 1 · Aldehydes Ketones and Carboxylic Acids

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Which one of the following reactions does not represent correct combination of substrate and product under the given conditions?
  1. (A)(see structure)
  2. (B)(see structure)
  3. (C)(see structure)
  4. (D)(see structure)
    ✓ Correct

Answer: (D)

Solution

We need to identify the incorrect reaction. Option (D) is incorrect because when toluene is oxidized with alkaline KMnO₄, the methyl group is oxidized to a carboxylate ion (benzoate), not to benzoic acid directly. The product shown in option (D) appears to be incorrect for the given conditions. In alkaline medium, the product would be the carboxylate salt, and acidification would be needed to obtain the free carboxylic acid. The other options (A), (B), and (C) represent correct transformations under the stated conditions.

JEE Main · 2022 · 25 Jul 2022 · Shift 1 · Single correct option

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