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

N H_{2} O H

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N H_{2} N H_{2}

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K C N

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N o n e o f t h e s e

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Solution

The correct option is B $K C N$
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 $N_{2}$ on heating much before they react with Na.Hence, the answer is (c).

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Which of the following compound will answer lassaigne's test for nitrogen?

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