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An alkanediol, composed of alkane and diol, are a group of substances consisting of linear or branched hydrocarbon chains containing exactly two hydroxy groups at different positions. They are a subgroup of the diols and contain no other heteroatoms or multiple bonds.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/3/3d/Dioles_Structural_Formulae_V.1.svg/260px-Dioles_Structural_Formulae_V.1.svg.png)
a 1,3-diol (1,3-Propanediol, middle)
and a 1,4-diol (1,4-Butanediol, bottom).