A) \[N{{H}_{2}}CONH.N{{H}_{2}}.HCl\]
B) \[N{{H}_{2}}N{{H}_{2}}.HCl\]
C) \[N{{H}_{2}}CON{{H}_{2}}\]
D) \[{{C}_{6}}{{H}_{5}}NH.\,N{{H}_{2}}.HCl\]
Correct Answer: B
Solution :
Hydrazine\[(N{{H}_{2}}.N{{H}_{2}})\] does not respond Lassaignes test because it does not contain any carbon and hence, \[NaCN\]is not formed.
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