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