Question Bank [2022] — Chemistry STD 12 Science — Question
Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryQuestion Bank [2022]2 Marks
Question
Explain the preparation of glucose from sucrose
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Answer
Preparation of glucose from sucrose:
Sucrose is hydrolysed by warming with dilute hydrochloric acid or sulfuric acid for about two hours.
This hydrolysis converts sucrose into a mixture of glucose and fructose.
Glucose is separated from fructose by adding ethanol during cooling.
Glucose being almost insoluble in alcohol crystallizes out first. The solution is filtered to obtain crystals of glucose. The reaction can be given as,
$\underset{\text { Sucrose }}{ C _{12} H _{22} O _{11}}+ H _2 O \underset{\Delta}{\stackrel{ H ^{+}}{\longrightarrow}} \underset{\text { Glucose }}{ C _6 H _{12} O _6}+\underset{\text { Fructose }}{ C _6 H _{12} O _6}$
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