Lassaigne's test for the detection of nitrogen fails in

Options

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`

Answer

B

Explanation

Some compound like hydrazine `(NH_(2)NH_(2))` althrough contain nitrogen, they do not respond lassaigne's test because they do not have any carbon & hence `NaCN` is not formed.