Consider the structural relationship between propan-1-amine ( amine) and N-methylethanamine ( amine) — Isomerism and Stereochemistry Chemistry Question

💡 Solution & Explanation

In IUPAC classification, primary ($1^\circ$), secondary ($2^\circ$), and tertiary ($3^\circ$) amines are formally considered entirely different functional groups. Because the fundamental nature of the functional group has changed from a primary amine to a secondary amine, they exclusively exhibit Functional Group Isomerism. They are not merely metamers, unlike ethers.