1.

For testing nitrogen in organic compounds, they are fused with sodium metal, extracted with water, and treated with FeSO_4 soln. and acidified.The presence of nitrogen is indicated by a blue or green colour or precipitate . This test is not given by

Answer»

UREA
hdrazine
PHENYLHYDRAZINE
ANTHRANILIC acid

Solution :This test is based on the formation of NaCN for which C and N are both provided by the organic compound.Among the given COMPOUNDS only hydrazine, `N_2H_4`, does not contain carbon (it is not an organic compound).So, it does not give the test under reference although it contains nitrogen .


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