Under the strict application of the Cahn-Ingold-Prelog (CIP) sequence rules for assigning E/Z config — Isomerism and Stereochemistry Chemistry Question

💡 Solution & Explanation

CIP priority is primarily determined by atomic number. If the atoms are identical isotopes of the exact same element, CIP Rule 2 dictates that atomic mass acts as the definitive tie-breaker. Tritium (mass 3) is heavier than Deuterium (mass 2) and Hydrogen (mass 1), making the order $-T > -D > -H$.