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

Lassaigne's test for the detection of nitrogen will fail in case of `:`

A

`NH_(2)CONHNH_(2).HCl`

B

`NH_(2)NH_(2).CHl`

C

`NH_(2)CONH_(2)`

D

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

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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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