Organic Chemistry Some Basic Principles and Techniques - Result Question 60

####66. Lassaigne’s test for the detection of nitrogen fails in

[1994]

(a) NH2CONHNH2HCl

(b) NH2NH2HCl

(c) NH2CONH2

(d) C6H5NHNH2HCl

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Solution:

  1. (b) Hydrazine (NH2NH2) does not contain carbon and hence on fusion with Na metal, it cannot form NaCN; so it does not show Lassaigne’s test for nitrogen.

This test fails in case of diazo compounds, dinitro compounds and compounds containing nitrogen in the ring.



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