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ChemistryNEET 2025Qualitative and quantitative analysis

Purification and Characterisation of Organic Compounds

Which one of the following reactions does not belong to Lassaigne's test?

  1. A.
  2. B.
  3. C.
  4. D.✓

Solution

Fusing sodium with the compound gives NaCN, and NaX from nitrogen, sulphur and halogen respectively — the basis of Lassaigne's test. Oxidising carbon with CuO to is the Liebig combustion method for estimating carbon, not Lassaigne's.

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