Isomers

Isomers are compounds with the same molecular formula.

eg. 1:  Butane and isobutane have the same molecular formula: C4H10. Therefore, they are isomers.



eg. 2:  Maleic acid and fumaric acid have the same molecular formula: C4H4O4.  Therefore, they are isomers.



eg. 3:  (R)-Lactic acid and (S)-Lactic acid have the same molecular formula: C3H6O3.  Therefore, they are isomers.



see also constitutional isomers, stereoisomers

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