Chemistry / Unit 12 Chem 2435 short lesson, about 20 seconds
Structural Isomers Defined
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The idea
Structural, or constitutional, isomers share the same molecular formula but differ in how their atoms are connected to each other.
In practice
n-Butane and 2-methylpropane both have formula C4H10, but one is unbranched and the other has a branch.
Where people slip
Two Lewis structures drawn differently on paper are not automatically different isomers — the same chain drawn straight, bent, or coiled is one molecule.
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