Presence of nitrogen in which among the following compounds cannot be detected by Lassaigne method?

Hydrazine

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Aniline

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p-toluidine

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Picric acid

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Solution

The correct option is B Hydrazine
Lassaigne's method is used to detect the presence of elements like $N, S, F, C l, B r, I$ etc in an organic sample.
Since, hydrazine is not an organic compound, thus it cannot detected by Lassaigne method.

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