Write a Short Note on Libermann՚S Nitroso Test: Libermann՚S Nitroso Test (For CBSE, ICSE, IAS, NET, NRA 2022)

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Libermann՚S Nitroso Test

  • While phenol is reacted with and concentrated it provides a deep green or blue colour which changes to red on dilution with water.
  • While generated alkaline along with original green or blue colour is restored.
  • This reaction is termed as Libermann՚s nitroso reaction and is employed as a test of phenol.
  • Libermann՚s nitroso test is is used as a test for secondary amines. Secondary amine (aliphatic as well as aromatic) reacts with nitrous acid to form N-nitrosoamines. Where N-Nitrosodimethyl amine.
  • Nitrosoamines are water soluble yellow oils and when warmed with phenol and few dropos of conc.

About

  • Sodium nitrite is an inorganic compound with the chemical formula .
  • It is a white to slightly yellowish crystalline powder that is very soluble in water and is hygroscopic.
  • From an industrial perspective, it is the most important nitrite salt.

About

  • Sulfuric acid or sulphuric acid, also known as oil of vitriol, is a mineral acid composed of the elements sulfur, oxygen and hydrogen, with molecular formula
  • It is a colorless and viscous liquid that is soluble in water and is synthesized in reactions that are highly exothermic

Libermann՚S Nitroso Reaction

Illustration 2 for Libermanns_Nitroso_Reaction
  • This is a test for secondary amines.
  • Secondary amines (aliphatic as well as aromatic) reacts with nitrous acid to form N-nitrosoamines.

  • Where the product obtained is N-Nitrosodimethyl amine.
  • The Secondary amines can be either aliphatic or aromatic.