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JEE Main202228 Jun 2022Morning ShiftChemistryGeneral Organic ChemistryActual

The formula of the purple colour formed in Laissaigne's test for sulphur using sodium nitroprusside is

Options

  1. ANa 4 Fe CN 5 NOS
  2. BNaFe Fe CN 6
  3. CNa Cr NH 3 2 NCS 4
  4. DNa 2 Fe CN 5 NO

Correct answer

A. Na 4 Fe CN 5 NOS

Step-by-step solution

Na 2 S Lassaigne ' s   extract + Na 2 Fe ( CN ) 5 NO → Na 4 Fe ( CN ) 5 NOS Purple   colour On treating sodium fusion extract with sodium nitroprusside, appearance of a violet colour further indicates the presence of sulphur.

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