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Q.

A compound which does not give a positive test in Lassaigne’s test for nitrogen is

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a

Urea

b

Phenyl hydrazine

c

Hydrazine

d

Azobenzene

answer is B.

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Detailed Solution

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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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