Is it possible to distinguish between hydrazine and phenyl-hydrazine by the Lassaigne's test? Give your reason.

Explanation

For the detection of nitrogen in an organic compound by Lassaigne's test, the compound must contain both C and N, So as to permit the formation of NaCN. Pheylhydrazine contains both C and N. So it gives a positive test for nitrogen in Lassaigne's test. On the other hand hydrazine contains nitrogen but does not contain carbon and so it gives a negative test for nitrogen. Thus the two compounds can be distinguished by Lassaigne's test.