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Lassigne's test in not shown by diazoniu...

Lassigne's test in not shown by diazonium salts and hydrazines `(NH_2NH_2)`. Why?

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Diazonium salts `(C_6 H_6 N_2^(+)X^(-))` readily lose `N_2` on heating before reacting with fused sodium metal. Therefore, these do not give positive Lassaigne.s test for nitrogen.
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