Homologous Series
| Formula / Notation | CₙH₂ₙ₊₂ → CₙH₂ₙ₊₄ (differ by CH₂) |
|---|---|
| Also Known As | Homologous series, homologs, alkane series, functional group series |
What is Homologous Series?
A series of organic compounds with the same functional group and general formula, differing from each other by a -CH₂- unit. Each member has similar chemical properties but gradually changing physical properties. Examples include the alkanes (CₙH₂ₙ₊₂) and alcohols.
Formula & Notation
Other Names / Synonyms: Homologous series, homologs, alkane series, functional group series
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
A series of organic compounds with the same functional group and general formula, differing from each other by a -CH₂- unit. Each member has similar chemical properties but gradually changing physical properties. Examples include the alkanes (CₙH₂ₙ₊₂) and alcohols.
The homologous series concept allows prediction of physical and chemical properties of unsynthesised compounds by interpolation or extrapolation from known members. It is the basis for understanding trends in detergent chain length (solubility/emulsification balance), biodegradability with chain len…
Within a homologous series, toxicity and flammability generally change with chain length: short-chain alkanes are more volatile (lower LEL) and more potent narcotic; longer chains are less volatile but more persistent environmental contaminants. Never assume all members of a series are equally hazar…
The formula or notation for Homologous Series is: CₙH₂ₙ₊₂ → CₙH₂ₙ₊₄ (differ by CH₂)