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Diazo compounds,sometimes donot respond Lassaigne's test for nitrogen because

$ \begin{array}{1 1}(a)\;\text{These contain very little carbon}\\(b)\;\text{These are quite stable compounds and do not decompose to elemental nitrogen}\\(c)\;\text{Their nitrogen contents is removed,during heating in the form of nitrogen gas}\\(d)\;\text{These form organo metallic compounds with sodium}\end{array}$

1 Answer

Diazonium salts are unstable and lose nitrogen as $N_2$ gas on heating.Hence during fusion,no NaCN is formed in Lassaigne's extract due to the loss of nitrogen.
Hence (c) is the correct answer.
answered Mar 4, 2014 by sreemathi.v
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