Lassaigne's test for the detection of nitrogen fails in [CBSE PMT 1994

1.	Lassaigne's test for the detection of nitrogen fails in [CBSE PMT 1994]
A.	\[N{{H}_{2}}CONHN{{H}_{2}}.HCl\]
B.	\[N{{H}_{2}}N{{H}_{2}}.HCl\]
C.	\[N{{H}_{2}}CON{{H}_{2}}\]
D.	\[{{C}_{6}}{{H}_{5}}NHN{{H}_{2}}.HCl\]
Answer» C. \[N{{H}_{2}}CON{{H}_{2}}\]

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Lassaigne's test for the detection of nitrogen fails in [CBSE PMT 1994]

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