A) \[N{{H}_{2}}CONHN{{H}_{2}}.HCl\]
B) \[N{{H}_{2}}N{{H}_{2}}.HCl\]
C) \[N{{H}_{2}}CON{{H}_{2}}\]
D) \[{{C}_{6}}{{H}_{5}}NHN{{H}_{2}}.HCl\]
Correct Answer: B
Solution :
Some compound like hydrazine \[(N{{H}_{2}}N{{H}_{2}})\] although contain nitrogen, they do not respond lassaigne's test because they do not have any carbon & hence \[NaCN\] is not formed.
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