Lassaigne's test for the detection of nitrogen will fail in the case of:

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

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

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N H_{2} N H_{2}

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

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Solution

The correct option is C $N H_{2} N H_{2}$
Lassaigne's test is used to determine the presence of $M$ in organic compounds.
But as $N H_{2} N H_{2}$ is an inorganic compound. No carbon is present in this compound thus it will give negative Lassaigne's test.
In Lassaigne's test
$N a + C + N ⟶ N a C N$
Thus carbon must be present for formation of $N a C N$ which is further used for test.

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