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Acetone gives an orange-yellow precipitate with Brady's reagent. The precipitate is

  1. Aacetone semicarbazone
  2. Bacetone cyanohydrin
  3. Cacetone 2,4-dinitrophenylhydrazone
  4. Dacetone oxime

Answer: C

Brady's reagent is 2,4-dinitrophenylhydrazine in acid; it condenses with the carbonyl group to give the coloured 2,4-dinitrophenylhydrazone, a general test for aldehydes and ketones.
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