Lassaigne’s test for the detection of Nitrogen fails in

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NH2CONHNH2.HCl

NH2NH2.HCl

NH2CONH2

C6H5NHNH2.HCl

answer is B.

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Detailed Solution

NH2.NH2.HCl doesn’t contain “C” which is needed for the formation of NaCN Na+C+N→NaCN.

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