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Lassaigne's test for the detection of ni...

Lassaigne's test for the detection of nitrogen fails in

A

`NH_(2)CONHNH_(2)HCl`

B

`NH_(2)NH_(2) HCl`

C

`NH_(2)CONH_(2)`

D

`C_(6)H_(5)NHNH_(2)HCl`

Text Solution

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The correct Answer is:
B
Some compound like hydrazine `[NH_(2)NH_(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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