A) \[{{H}_{2}}N-CO-NHN{{H}_{2}}\cdot HCl\]
B) \[N{{H}_{2}}-N{{H}_{2}}\cdot HCl\]
C) \[N{{H}_{2}}-CO-N{{H}_{2}}\]
D) \[{{C}_{6}}{{H}_{5}}-NH-N{{H}_{2}}\cdot HCl\]
E) \[{{C}_{6}}{{H}_{5}}CON{{H}_{2}}\]
Correct Answer: B
Solution :
Lassaignes test is given by those nitrogenous compounds in which carbon is also present along with nitrogen. In \[N{{H}_{2}}\cdot N{{H}_{2}}\cdot HCl,\]carbon is absent, so it does not give Lassaignes test.
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