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The above Lassaigne's extract on treatment with Fe2+ does not give a blood red colour because of the
  1. Absence of S in the organic compound
  2. Presence of halogen in the organic compound
  3. Dissociation of NaSCN into Na2S and NaCN
  4. Conversion of NaSCN into HSCN


Solution

The correct option is C Dissociation of NaSCN into Na2S and NaCN
If the Lassaigne's extract gives a violet coloured complex, it clearly confirms the presence of Sulphur.

The formation of a Prussian blue coloured complex confirms the presence of Nitrogen.

If Lassaigne's extract does not give a blood red coloured complex, it means that the excess of Na metal caused dissociation of NaSCN into Na2S and NaCN
2Na+NaSCNΔNa2S+NaCN

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