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JEE Main Chemistry question

ChemistryAldehydes, Ketones and Carboxylic AcidsJEE Main

The reagent(s) which can be used to distinguish acetophenone from benzophenone are/is: (1) 2,4-dinitrophenylhydrazine, (2) aqueous NaHSO₃, (3) Benedict's reagent, (4) I₂ and NaOH, (5) Tollens' reagent, (6) Fehling's solution. How many of these reagents successfully distinguish the two?

Answer: 1

Solution

Both are ketones, so 2,4-DNPH gives a positive test with both (no distinction); neither reduces Benedict's reagent, Tollens' reagent or Fehling's solution (none are aldehydes, so no distinction from any of these three); NaHSO₃ addition is unreliable for distinguishing aromatic ketones of this type and is not

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Question ID VK-150174