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Question

Which of the following compounds will give positive Lassaigne's test for nitrogen?

A
NH2OH
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B
NH2NH2
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C
KCN
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D
Noneofthese
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Solution

The correct option is B KCN
Positive Lassaigne's lest is given by the compound which contains both C and N. Moreover, this test is not given by diazonium compounds because they lose N2 on heating much before they react with Na.Hence, the answer is (c).

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