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

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

JamiaJamia 2007

Solution:

If nitrogen is present in organic compound then sodium extract contains $ N{{a}_{4}}[Fe{{(CN)}_{6}}] $ . $ Na+C+N\xrightarrow[{}]{fuse}NaCN $ $ FeS{{O}_{4}}+6NaCN\xrightarrow[{}]{{}}\underset{(A)}{\mathop{N{{a}_{4}}[fe{{(CN)}_{6}}]}}\,+N{{a}_{2}}S{{O}_{4}} $ A changes to Prussian blue $ F{{e}_{4}}{{[Fe{{(CN)}_{6}}]}_{3}} $ on reaction with $ FeC{{l}_{3}} $ . $ 4FeC{{l}_{3}}+3N{{a}_{4}}[Fe{{(CN)}_{6}}]\xrightarrow[{}]{{}} $ $ F{{e}_{4}}{{[Fe{{(CN)}_{6}}]}_{3}}+12NaCl $