Which of the following compound is expected to give red colouration
while performing Lassaigne's test of nitrogen
Urea
Thiourea
Aniline
Nitrobenzene
Thiourea will give a red colour in Lassaigne's test as it contains N and S atoms and C and will form sodium thiocyanate on fusion with sodium.
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https://www.meritnation.com/ask-answer/question/discuss-the-chemistry-of-lassaignes-test/organic-chemistry-some-basic-principles-and-techniques/6326386
Kindly refer to the following link:
https://www.meritnation.com/ask-answer/question/discuss-the-chemistry-of-lassaignes-test/organic-chemistry-some-basic-principles-and-techniques/6326386