Which of the following nitrogenous compounds does not give blue colour in the usual Lassaigne's test for the detection of nitrogen?

Glycine

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Urea

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Aniline

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Hydrazine

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Solution

The correct option is D Hydrazine
Lassaigne's test is not given by compounds which do not contain $C$ atoms.
As $N H_{2} - N H_{2}$ does not produce $N a C N$ it will not respond to this test.

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