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

Lassaigne's test for the detection of nitrogen fails in-

A

`H_(2)N-CO-NHNH_(2)*HCI`

B

`NH_(2)-NH_(2)*HCI`

C

`C_(6)H_(5)-NH-NH_(2)*HCI`

D

`C_(6)H_(5)CONH_(2)`

Text Solution

Verified by Experts

The correct Answer is:
B
Lassaigne's test is given by those nitrogenous compounds in which carbon is also present along with nitrogen.
In `NH_(2) - NH_(2) * HCI`, carbon is absent, so it does not give Lasssigne's test.
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