For which of the following compounds, the Lassaigne's test for the detection of nitrogen will fail?

H_{2} N - C O - N H_{2}

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

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N H_{2} - N H_{2} .2 H C l

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H_{2} N - C O - N H - N H_{2} . H C l

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Solution

The correct option is A $N H_{2} - N H_{2} .2 H C l$
Lassaigne's test is not given by compounds, which do not contain C atoms but contains N atoms like Hydrazine $(N H_{2} - N H_{2}), N H_{2} - O H$ .
Option (C) is correct as it does not have any carbon atom.

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