Question

What does cellulose give on complete hydrolysis?

• A. $D-$ ribose
• B. $D-$ glucose
• C. $L-$ glucose
• D. $D-$ fructose

Answer 1

Answer: (B)

Cellulose is a linear polymer of $\beta -D-$ glucose in which $C_1$ of one glucose unit is connected to $C_4$ of the other through glycosidic linkage.

It does not undergo hydrolysis easily. However on heating with dilute $H_{2}S{O}_4$ under pressure. It does undergo hydrolysis to give only $D-$ glucose.
${\left(C_6{H}_{10}{O}_5\right)}_n+{\left(nH\right)}_{2}O\stackrel{H^{+}}{\to }\underset{D-Glucose}{2C_6{H}_{12}{O}_6}$