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Q.

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

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a

Urea

b

Hydrazine

c

Azobenzene 

d

Phenylhydrazine

answer is B.

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Detailed Solution

Hydrazine NH2NH2does not contain carbon and hence on fusion with Na metal, it cannot form NaCN; consequently hydrazine does not show Lassaigne’s test for nitrogen. 

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