When multiple types of structural isomerism are simultaneously possible between two compounds, which of the following priority sequences is correctly used to determine their primary isomeric relations

Question

When multiple types of structural isomerism are simultaneously possible between two compounds, which of the following priority sequences is correctly used to determine their primary isomeric relationship?

Prashant Kotian · Accepted Answer

Correct answer: B. When establishing the relationship between two isomers, the universally accepted FMCP priority rule is applied: Functional isomerism > Metamerism > Chain isomerism > Positional isomerism. If tautomerism or ring-chain isomerism exists, they take priority over functional group isomerism.

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