Single Choice

A compound which does not give a positive result in the Lassaigne's test for nitrogen is:

Aurea
Bhydroxyl amine
Correct Answer
Cglycine
Dphenylhydrazine

Solution

Lassaigne's test is not given by compounds which do not contain C atoms.

As the atoms do not contain C atoms, so in sodium fusion extract $$CN^-$$ is not formed and prussian blue colour is not deserved.

Hydroxylamine $$=NH_{2}-OH$$
Urea $$= NH_{2}-CO-NH_2$$
Glycine $$=C_{_{2}}H_{5}NO_{2}$$
Phenylhydrazine $$=Ph-NH-NH_{2}$$


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