Question
Which compound does not give positive test in Lassaigne's test for nitrogen?
✓
Answer
In Lassaigne's test, the organic compound is fused with sodium.
Carbon and nitrogen present in the organic compound gives sodium cyanide $\ce{(NaCN)}$.
This is further used in the test for nitrogen.
Hydrazine $\ce{(H_2N − NH_2)}$ do not contain carbon. It cannot form $\ce{NaCN}$ on fusion with sodium.
Hence, hydrazine cannot give Lassaigne's test for nitrogen.
Carbon and nitrogen present in the organic compound gives sodium cyanide $\ce{(NaCN)}$.
This is further used in the test for nitrogen.
Hydrazine $\ce{(H_2N − NH_2)}$ do not contain carbon. It cannot form $\ce{NaCN}$ on fusion with sodium.
Hence, hydrazine cannot give Lassaigne's test for nitrogen.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The half life period of a first order reaction is 6.93 minute. How much time would it take for 99% completion (log 2 = 0.3010) :
Nitration of xylene gives only one mono-nitro derivative. Which xylene is it?
Functional group in saturated carboxylic acid is:
Coordination number $( CN )$ of Ni in the complex $Na _2[ Ni ( EDTA )]$ is?
→Barbituric acid is used as:
The correct representation of $\ce{CuSO_{4}⋅5H_2O}$ is:
→Which one of the following is the strongest base in aqueous solution?
Aniline dissolves in HCl due to the formation of:
Which product is obtained on oxidation of aldehyde ?