Formaldehyde can be distinguished from acetaldehyde by the use of

  • A
    Schiff's reagent
  • B
    Tollen's reagent
  • C
    $I_2 / \text{Alkali}$
  • D
    Fehling's solution

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(Image of $3-$formylcyclohexanone reacting with $[Ag(NH_3)_2]^+$)

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