A) \[N{{H}_{2}}N{{H}_{2}}\]
B) \[{{C}_{6}}{{H}_{5}}NHN{{H}_{2}}\]
C) \[PhN=NPh\]
D) \[N{{H}_{2}}CON{{H}_{2}}\]
Correct Answer: A
Solution :
Presence of carbon alongwith nitrogen is an essential condition for giving positive Lassaignes test for nitrogen. Hence, \[N{{H}_{2}}\,.\,N{{H}_{2}}\] (due to absence of carbon) does not give Lassaignes test for nitrogen.
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