H
Homologous Series
AllChemicals — The Online Chemical Glossary | https://allchemicals.info/chemical/493-homologous-series
What is Homologous Series?
A homologous series is a family of organic compounds that share the same general molecular formula and functional group, with consecutive members differing by a –CH₂– unit. Members of a homologous series show gradual, predictable changes in physical properties (boiling point, density) but similar chemical properties. The alkanes (CₙH₂ₙ₊₂) are a classic example.
Key Facts
Term
Homologous Series
Index
All "H" terms
Frequently Asked Questions
A homologous series is a family of organic compounds that share the same general molecular formula and functional group, with consecutive members differing by a –CH₂– unit. Members of a homologous series show gradual, predictable changes in physical properties (boiling point, density) but similar chemical properties. The alkanes (CₙH₂ₙ₊₂) are a classic example.
More "H" Terms
Haber Process
N₂ + 3H₂ ⇌ 2NH₃ | ΔH = −92 kJ/mol
Hafnium
Hf
Half Cell
Half Life
Half-Cell
E = E° − (RT/nF)lnQ
Half-Life
A(t) = A₀e^(−λt); t½ = ln2/λ
Half-Reaction
Halide
X⁻ (e.g., F⁻, Cl⁻, Br⁻, I⁻)
Halogen
F₂, Cl₂, Br₂, I₂, At; Group 17; ns²np⁵ valence configuration
Halogenation
C-X + Cl₂/Br₂ (hv or AlCl₃) → C-X(halogen); EAS or radical pathway
Halogens
Hard Acid
Hard acid: small, highly charged, low polarisability (e.g., H⁺, Mg²⁺, Al³⁺)
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