Question
Chemistry Question on Organic Chemistry- Some Basic Principles and Techniques
Lassaigne's test for the detection of nitrogen fails in
A
NH2CONHNH2 . HCI
B
NH2NH2 . HCI
C
NH2CONH2
D
C6H5NHNH2.HCI
Answer
NH2NH2 . HCI
Explanation
Solution
Lassaigne's test is given by only those compounds which contain both carbon and nitrogen.
- When compounds containing C and N are heated with sodium, they form NaCN which is easily detected by FeCl3.
- Some compounds live hydrazine (NH2 . NH2) contain nitrogen but they do not respond.
- In Lassaigne's test there's no carbon and hence, NaCN is not formed.
- NH2NH2.HCl does not pass Lassaigne's test since it contains no carbon.
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