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NEET2012ChemistryAldehydes and KetonesActual

CH ₃ CHO and C ₆ H ₅ CH ₂ CHO can be distinguished chemically by

Options

  1. ABenedict test
  2. BIodoform test
  3. CTollen's reagent test
  4. DFehling solution test

Correct answer

B. Iodoform test

Step-by-step solution

CH ₃ CHO and C ₆ H ₅ CH ₂ CHO both being aliphatic aldehydes react with Tollen's reagent, Fehling solution and Benedict solution. So, these reagents cannot be used to distinguish them. CH ₃ CHO reacts with NaOH and I ₂ to give yellow crystals of iodoform while C ₆ H ₅ CH ₂ CHO does not react with it. aligned CH ₃ CHO +3 I ₂+ & 4 NaOH CHI ₃ + HCOONa +3 NaI +3 H ₂ O C ₆ H ₅ CH ₂ CHO + I ₂ & + NaOH No reaction aligned Thus, CH ₃ CHO and C ₆ H ₅ CH ₂ CHO can be distinguished by iodoform test.

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