QJEEM04Ch8177: JEE Main 2004 Chemistry - Class 11 JEEM04Ch8177 Solution: The compound formed in the positive test for nitrogen with the…

Question

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The compound formed in the positive test for nitrogen with the Lassaigne solution of an organic compound is

Accepted Answer

If nitrogen is present in organic compound, then sodium extract contains NaCN.

Na + C + N

\overset{F u s e}{⟶}

NaCN

FeSO₄ + 6NaCN

\to

Na₄[Fe(CN)₆] + Na₂SO₄

Na₄[Fe(CN)₆] changes to prussian blue Fe₄[Fe(CN)₆]₃ on reaction with FeCl₃.

FeCl₃ + Na₄[Fe(CN)₆]

\to

Fe₄[Fe(CN)₆]₃ + 12NaCl

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