What Is a Homologue?

Homologue refers to organic compounds with similar structures and several "CH ₂ " atomic groups differing in molecular composition; they generally appear in organic chemistry and must be of the same type (containing the same and equivalent functional groups, with the exception of hydroxyl groups, Phenols and alcohols cannot be homologs, such as phenol and benzyl alcohol). But it is worth noting that one is that most of the homologs differ by one or n methylene groups; the other is that substances with the same group are not necessarily homologs.

Homologous

(1) Structural similarity means: the characteristics of carbon-carbon chain and carbon bond are the same; the functional groups are the same; the number of functional groups is the same;

None are homologs.

Isotopes: Atoms with the same number of protons and different numbers of neutrons. Structurally, the electronic layer structure is the same, but the atomic structure is different. Different physical properties, the same chemical properties.

Allomorphs: different elements made up of the same element. The elemental composition or structure is different. Different physical properties, chemical properties may be different or the same.

Isomers: Compounds with the same molecular formula and different structures. Organic isomers are divided into carbon chains, positions, and functional groups. Different physical properties, not necessarily the same chemical properties. ^[2]