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Solution


Q.

Which of the following nitrogen containing compound does not give Lassaigne’s test              [2024]
1

Glycine

 

2

Hydrazine

 

3

Phenyl hydrazine

 

4

Urea

 


Ans.

(2)

In Lassaigne's test for nitrogen, NaCN is formed in sodium fusion extract, which is then tested further. Hydrazine (NH2-NH2) does not contain carbon hence NaCN cannot be formed in sodium fusion extract. So hydrazine does not give Lassaigne 's test for nitrogen.