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By Sarah MartinezFebruary 3, 2026

isomerism is the phenomenon in which different compounds have the same molecular formula but a different structure and properties. This is due to the ability of carbon atoms to form different bonds, leading to distinct arrangements of atoms in space.

Isomerism can be categorized into two main types: structural isomerism and stereoisomerism. Let's delve into each type, their subclasses, and provide examples to illustrate these fascinating variations in molecular structure.

Structural Isomerism

Structural isomers are compounds with the same molecular formula but different connectivity of atoms. They are also known as constitutional isomers. This type of isomerism can be subclassified into several groups:

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Chain Isomers

Chain isomers differ only in the arrangement of carbon atoms in their hydrocarbon chains. For example, butane (C4H10) has straight and branched chain isomers:

n-Butane: CH3CH2CH2CH3
Isobutane: (CH3)3CH

Positional Isomers

Positional isomers, also called substitution isomers, have the same molecular formula but differ in the position of substituent groups along the carbon chain. n-Butyl alcohol (C4H9OH) and isobutyl alcohol (C4H9OH) are positional isomers:

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n-Butyl alcohol: CH3CHOHCH2CH3
Isobutyl alcohol: (CH3)2CHCH2OH

Functional Isomers

Functional isomers have the same molecular formula but differ in the type of functional group attached to their carbon chains. For instance, ethanol (C2H5OH) and ethylene oxide (C2H4O) are functional isomers with different functional groups:

Ethanol: CH3CH2OH
Ethylene oxide: CH2CH2O

Stereoisomerism

Stereoisomers are compounds with the same molecular formula, connectivity, and geometry but differ in the spatial arrangement of their atoms. Stereoisomerism can be further divided into:

Geometric Isomers (or Cis-Trans Isomers)

Geometric isomers have identical molecular formulas and constitutional structures but differ in the spatial relationships of functional groups around a rigid structure, usually a carbon-carbon double bond. (Z)-But-2-ene and (E)-But-2-ene are geometric isomers:

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(Z)-But-2-ene: CH3CH=CHCH3 (cis)
(E)-But-2-ene: CH3CH=CHCH3 (trans)

Optical Isomers

Optical isomers, or enantiomers, are non-superimposable mirror images of each other. For example, (2R,3S)-Butan-2-ol and (2S,3R)-Butan-2-ol are optical isomers:

(2R,3S)-Butan-2-ol: (CH3)CHOHCH(CH3)2
(2S,3R)-Butan-2-ol: (CH3)CHOHCH(CH3)2

Understanding isomerism is crucial in chemistry as it explains the diversity of compounds with the same molecular formula but different properties and behaviors. Whether you're in the lab or learning about molecules, recognizing and distinguishing between isomers can enhance your understanding of chemical reactions and compound characteristics. So, keep exploring, and who knows, you might discover the next breakthrough in isomerism!