Question

8. Which compound does not give a positive result in the Lassaigne`s test for nitrogen?
a. Aniline b. Glycerine
c. Benzamide d. Urea

Answer 1

Answer:

In Lassaigne's test, the organic compound is fused with sodium.  

Carbon and nitrogen present in the organic compound gives sodium cyanide (NaCN).  

This is further used in the test for nitrogen.

Hydrazine (H2 N−NH2 )do not contain carbon. It cannot form NaCN on fusion with sodium.

Hence, hydrazine cannot give Lassaigne's test for nitrogen.

Answer 2

Answer:

hydrazine!!!!!!!!!!!!!!!!!!!!!!!!!!!