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Question

Which of the following compounds does not show Lassaigne's test for nitrogen?

A
Urea
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B
Azobenzene
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C
Hydrazine
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D
Phenylhydrazine
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Solution

The correct option is C Hydrazine
Hydrazine (NH2NH2) does not contain carbon. On fusion with Na metal, it cannot form NaCN. So, hydrazine does not show Lassaigne's test.

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