# Write a Chemical Reaction to Show that the Open Structure of D-glucose Contains the Following : Five Alcohol Groups - Chemistry

#### Question

Write a chemical reaction to show that the open structure of D-glucose contains the following :

Five alcohol groups

#### Solution

Acetylation of glucose with acetic anhydride gives glucose pentaacetate which confirms the presence of five -OH groups. Since it exists as a stable compound, five -OH groups should be attached to different carbon atoms.

$\begin{array}{cc} \ce{CHO} \phantom{.........................}\ce{CHO}\phantom{.........................}\\ \phantom{}|\phantom{..............................}|\phantom{............................}\\ \ce{(CHOH)4 + 5 (CH3CH)2O->(CHOCOCH3)4 + 5CH3COOH} \\ \phantom{}|\phantom{.........}\text{Acetic anhydride}\phantom{.....}|\phantom{........}\ce{O}\phantom{..................}\\ \ce{CH2OH}\phantom{........................}|\phantom{........}||\phantom{...................} \\ \text{Glucose} \phantom{........................}\ce{\underset{\text{Glucose Penta acetate}}{CH2O-C-CH3}}\phantom{.............} \end{array}$

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