When determining the structural isomeric relationship between pentan-2-one and pentan-3-one, multipl — Isomerism and Stereochemistry Chemistry Question
Question
When determining the structural isomeric relationship between pentan-2-one and pentan-3-one, multiple definitions seem to apply. Using the standard FMCP priority rule, what is their officially recognized relationship?
Answer: B
💡 Solution & Explanation
The FMCP Priority Rule dictates the hierarchy for naming structural isomers: Functional > Metamerism > Chain > Positional. Both compounds differ in position, but also differ in the alkyl groups attached to the polyvalent $-CO-$ group. Because Metamerism strictly overrules Positional isomerism, they are officially classified as Metamers.
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