Chemistry / Chem 2435 · Atom · ~20 seconds
Structural Isomers Defined
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Structural, or constitutional, isomers share the same molecular formula but differ in how their atoms are connected to each other.
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n-Butane and 2-methylpropane both have formula C4H10, but one is unbranched and the other has a branch.
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Two Lewis structures drawn differently on paper are not automatically different isomers — the same chain drawn straight, bent, or coiled is one molecule.