Dihydric alcohols
These are compound containing two hydroxyl sets. These are dihydroxy components of alkanes. Their general formula is CnH2n+2O2. The simplest and most important dihydric alcohol is ethylene glycol. They are classified as α, β, γ..... glycols, according to the relative position of two hydroxyl groups. α is 1, 2 glycol, β is 1, 3 glycol.
(1) Preparation
(i) From ethylene : (a) Through icy dilute alkaline solution of Bayer's reagent
![1531_dihydric alcohol preparation.png](https://www.expertsmind.com/../CMSImages/1531_dihydric alcohol preparation.png)
(b) With O2 in presence of Ag :
![603_dihydric alcohol preparation1.png](https://www.expertsmind.com/../CMSImages/603_dihydric alcohol preparation1.png)
(c) With HOCl followed by hydrolysis : (Industrial method)
![1640_dihydric alcohol preparation2.png](https://www.expertsmind.com/../CMSImages/1640_dihydric alcohol preparation2.png)
(ii) From 1, 2 dibromo ethane [Lab method]:
![1607_dihydric alcohol preparation3.png](https://www.expertsmind.com/CMSImages/1607_dihydric%20alcohol%20preparation3.png)
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