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KCET2013ChemistryAldehydes and Ketones

The reagent used to distinguish between acetaldehyde and benzaldehyde is

Options

  1. ATollen's reagent
  2. BFehling's solution
  3. C2-4-dinitrophenyl hydrazine
  4. Dsemicarbazide

Correct answer

B. Fehling's solution

Step-by-step solution

(i) Reaction with 2,4-dinitrophenylhydrazine (Brady's reagent) : Acetaldehyde and benzaldehyde react with 2,4-dinitrophenylhydrazine (DNP) to form yellow, orange or red ppt of 2,4-dinitrophenylhydrazones (DNP derivatives) (ii) Reaction with semicarbazide : Both acetaldehyde and benzaldehyde react with semicarbazide to form. (iii) Reduction ot Tollen's reagent both acetaldehyde and benzaldehyde reduce Tollen's reagent to metallic silver which deposit on the walls of the test tube as bright silver mirror (iv) Reducti

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