Lassaigne's test for the detection of nitrogen fails in:

{N H}_{2} C O N H {N H}_{2} . H C l

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{N H}_{2} {N H}_{2} . H C l

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{N H}_{2} C O {N H}_{2}

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C_{6} H_{5} N H {N H}_{2} . H C l

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Solution

The correct option is B ${N H}_{2} {N H}_{2} . H C l$
In the absence of carbon in the organic compound in Lassaigne's test, $N a C N$ is not formed as a product.
As $N H_{2} N H_{2} . H C l$ does not have any carbon, it does not respond to the Lassaigne's test.

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