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MDCAT Chemistry QUESTION #7800
Question 1

Which element cannot be detected directly in an organic compound by Lassaigne's test?

  • Chlorine
  • Nitrogen
  • Oxygen✔️
  • Phosphorous
Correct Answer Explanation

Oxygen is not detected by Lassaigne's test. Lassaigne's extract tests for N, S, halogens, P (as phosphide). Oxygen is usually analyzed by difference or combustion analysis.