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NEET2023ChemistryGeneral Organic ChemistryActual

In Lassaigne's extract of organic compound both nitrogen and sulphur are present, which gives blood-red colour with Fe 3 + due to the formation of

Options

  1. AFe SCN 2 +
  2. BFe 4 Fe CN 6 3 . xH 2 O
  3. CNaSCN
  4. DFe CN 5 NOS 4 -

Correct answer

A. Fe SCN 2 +

Step-by-step solution

When the organic sample containing nitrogen and sulphur is strongly heated with sodium metal the ionic compound sodium thiocyanate is formed. Sodium thiocyanate gives blood-red colour with neutral FeCl 3 . Na   + N + C + S → NaSCN SCN -     +   Fe 3 + → Fe SCN 2 +

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