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

Lassaigne's test for the detection of nitrogen fails in

A

`NH_(4)CONHNH_(2)`

B

`NH_(2)NH_(2)*HCl`

C

`NH_(2)CONH_(2)`

D

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

Text Solution

Verified by Experts

The correct Answer is:
B
Lassaigne's test is given by only those compounds which contain both carbon and nitrogen . When compound containing C and N heated with sodium , then it form NaCN which is easily detected by `FeCl_(3)`
Or
Some compounds live hydrazine `( NH_(2) * NH_(2))` although contain nitrogen but they do not respond Lassaigne's test because they do not have any carbon and hence , NaCN is not formed .
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