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Glucose is prepared commercially from the hydrolysis of ______ by boiling it with dilute H2SO4 at 393K under pressure.

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Glucose is prepared commercially from the hydrolysis of ______ by boiling it with dilute H2SO4 at 393K under pressure.

(a) starch

(b) sucrose

(c) galactose

(d) dextrose

This question was posed to me during an online interview.

I would like to ask this question from Biomolecules Carbohydrates in portion Biomolecules of Chemistry – Class 12

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Right choice is (a) starch

Explanation: An aqueous solution of corn starch is acidified with dilute H2SO4. This is then heated under pressure (2-3 bar) for hydrolysis to take place. After this, the liquid is neutralised with sodium carbonate and the resulting solution is concentrated under reduced pressure to get glucose crystals. This process is also used for obtaining glucose from cellulose.

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