Complete the following reaction:
\((C_6H_{10}O_5)_n\, \ + \, \ H_2O \overset{H^+}{\underset{393 K, 2-3 atm }{\longrightarrow}}?\)
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → \(n C_6H_{12}O_6\)
(C6H10O5)n is starch (or cellulose), a polymer of glucose units. On acid hydrolysis every glycosidic link is broken and each unit takes up one molecule of water, so n units give n molecules of glucose, \( \ce{C6H12O6} \).
Why the other options are incorrect
Option (2) nC12H22O11 — Incorrect. This is a disaccharide (maltose); complete acid hydrolysis does not stop at the disaccharide stage, and n starch units cannot give n molecules of a \( \ce{C12} \) sugar.
Option (3) nC2H4O2 — Incorrect. This is acetic acid, which is not a hydrolysis product of starch.
Option (4) nCHO — Incorrect. Not a real compound; the formula does not even balance the atoms of the reaction.
NCERT (2026-27 edition):
Preparation of Glucose – …
