A) \[N{{H}_{2}}\,CONHN{{H}_{2}}\,.HCl\]
B) \[N{{H}_{2}}N{{H}_{2}}.HCl\]
C) \[N{{H}_{2}}CON{{H}_{\text{2}}}\]
D) \[{{C}_{6}}{{H}_{5}}NHN{{H}_{2}}.\,HCl\]
Correct Answer: B
Solution :
Hydrazine \[(N{{H}_{2}}N{{H}_{2}})\] does not contain carbon and hence on fusion with Na metal, it cannot form NaCN; consequently hydrazine does not show Lassaigne's test for nitrogen.
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