Lassaigne's test for the detection of nitrogen fails in .............

1.	Lassaigne's test for the detection of nitrogen fails in ............. .
Answer» `H_(2)N-CO-NH.NH_(2).HCl` `NH_(2)-NH_(2).HCl` `C_(6)H_(5)-NH-NH_(2).HCl` `C_(6)H_(5)CONH_(2)` ANSWER :C

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