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JEE Main Chemistry question

ChemistryOrganic Chemistry - Some Basic Principles and TechniquesJEE Main

According to IUPAC nomenclature, what is the lowest possible sum of locants for a benzene ring bearing ethyl, fluoro and methoxy substituents at alternating (1,3,5-type) ring positions?

Answer: 9

Solution

With the three substituents at alternating ring positions, the lowest-locant rule assigns them the locant set {1, 3, 5} (no other numbering of three alternating substituents on a six-membered ring can give a lower set, since adjacent alternating positions

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Question ID VK-142899