A compound which does not give a positive test inLassaigne's testfor nitrogen is :

Glycine

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Hydrazine

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Urea

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Phenyl hydrazine

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Solution

The correct option is B Hydrazine
Positive Lassaigne's test is given by containing both C and N
a. $N H_{2} C O N H_{2}$ (Contains both C and N)
b. $N H_{2} - N H_{2}$ (Does not contain C). So, the test is not given by (b).
c. Glycine $(N H_{2} - C H_{2} - C O O H)$ . (Contains both C and N)
d. $P h - N H - N H_{2}$ (Contains both C and N)

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