There is no direct test for the detection 0? following in organic compound 

There is no test (Direct) for the detection of following in an organic compound:

There is no direct test for the detection of which element in an organic compound?

Give the test for detection of P in an organic compound.

Why is Beilstein's test not regarded as a reliable test for the detection of a halogen in an organic compound?

In the Lassaigne's test for the detection of nitrogen in an organic compound, the appearance of blue coloured compound is due to

In the Lassaigne's test for the detection of nitrogen in an organic compound, the appearance of blue coloured compound is due to

Give the chemistry of Lassaigne's test for detection of N in an organic compound.