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Question

Chemistry Question on Organic Chemistry- Some Basic Principles and Techniques

Lassaigne's test for the detection of nitrogen fails in

A

NH2_2CONHNH2_2 . HCI

B

NH2NH2_2NH_2 . HCI

C

NH2CONH2NH_2CONH_2

D

C6H5NHNH2.HCIC_6H_5NHNH_2 . HCI

Answer

NH2NH2_2NH_2 . 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_3.
  • Some compounds live hydrazine (NH2_2 . NH2_2) 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.

Lassaigne's test

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