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AP EAMCET202018 Sep 2020Morning ShiftChemistryGeneral Organic ChemistryActual

Which of the products indicates the presence of sulphur atom in an organic compound, in qualitative elemental analysis?

Options

  1. A( Fe ₂ SO ₄ )
  2. BZnS
  3. C( MgS )
  4. D( PbS )

Correct answer

D. ( PbS )

Step-by-step solution

In qualitative elemental analysis of organic compounds (Lassaigne test) sulphur atom of the organic molecule gets converted into water soluble salt ( Na ₂ ~S ). It is tested with lead acetate ( ( CH ₃ COO )₂ ~Pb ) solution to give a black ppt. of ( PbS ). ( Na ₂ ~S (a q) ( CH ₃ COO ) Pb Black PbS +2 CH ₃ COONa )

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