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 recogni

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?

Prashant Kotian · Accepted Answer

Correct answer: B. 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 group. Because Metamerism strictly overrules Positional isomerism, they are officially classified as Metamers.

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