Q. Lassaigne’s test for the detection of nitrogen fails in
A) $H_{2}N - CO - NHNH_{2}.HCl$
B) $NH_{2} - NH_{2}.HCl$
C) $NH_{2} - CO - NH_{2}$
D) $C_{6}H_{5} - NH - NH_{2}.HCl$
Explanation
(b)
Lassaigne’s test is given by those nitrogenous compounds in which carbon is also present along with nitrogen.
In $NH_{2}.NH_{2}.HCl,$ carbon is absent, so it does not given Lassaigne’s test.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.