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2026 season is open · National Exam · April 10–19, 2026 · see the timeline →

Tag: Stereochemistry

  • USNCO Stereochemistry: R/S, E/Z and Fischer Projection Traps

    A repeatable exam-room workflow for USNCO organic questions. Learn to assign CIP priorities correctly, handle hydrogen placement in R/S configurations, compare high-priority groups for E/Z alkenes, and track swaps in Fischer projections without rotating drawings incorrectly.