Which of the following compounds is a known JEE exception that gives a false-positive green flame in — Practical Organic Chemistry and Purification Chemistry Question
Question
Which of the following compounds is a known JEE exception that gives a false-positive green flame in the Beilstein test despite containing no halogens?
Answer: B
💡 Solution & Explanation
Urea and thiourea can form volatile copper cyanides upon strong heating, which impart a green/blue flame identical to volatile copper halides, causing a false positive.
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