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Which of the following non-halogenated compounds is a famous JEE trap that yields a false-positive g — Practical Organic Chemistry and Purification Chemistry Question

Question

Which of the following non-halogenated compounds is a famous JEE trap that yields a false-positive green flame in the Beilstein test?

Answer: C

💡 Solution & Explanation

Urea ($NH_2CONH_2$) and thiourea form volatile copper cyanides upon strong heating, which impart a green/blue flame indistinguishable from halogens.

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