Which type of chemical reaction results in the formation of glucose pentaacetate when glucose reacts with acetic anhydride?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. Acetylation of glucose.
The reaction that leads to the formation of glucose pentaacetate from glucose and acetic anhydride is known as acetylation. In this reaction, all five hydroxyl (-OH) groups of glucose, including the one involved in the hemiacetal structure, react with acetic anhydride in the presence of an acid catalyst, typically glacial acetic acid or pyridine.
The process results in the substitution of the hydrogen atoms in the hydroxyl groups with acetyl groups (-COCH₃), forming glucose pentaacetate. This derivative is important in organic chemistry and carbohydrate studies, as it helps in determining the structure of glucose and understanding the reactivity of its functional groups.
Other Options :
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Oxidation – Involves the increase in oxidation state, not acetyl group substitution.
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Addition of ketone – Refers to the addition of a ketone group, not applicable here.
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Reduction – Involves the gain of electrons or hydrogen, irrelevant to this reaction.