MCQ
Lassaigne's test for the detection of nitrogen fails in
  • A
    $N{H_2}CONHN{H_2}.HCl$
  • $N{H_2}N{H_2}.HCl$
  • C
    $N{H_2}CON{H_2}$
  • D
    ${C_6}{H_5}NHN{H_2}.HCl$

Answer

Correct option: B.
$N{H_2}N{H_2}.HCl$
b
(b) Some compound like hydrazine $(N{H_2}N{H_2})$ although contain nitrogen, they do not respond lassaigne's test because they do not have any carbon & hence $NaCN$ is not formed.

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