Question

_____, a polysaccharide having $\beta$-D-glucoside units, has a stronger and more compact physical structure than starch which has $\alpha$-D-glucsoe unit.

• A. Cellulose
  
• B. L-Fructose
• C. D-Fructose
• D. None of these

Answer 1

Answer: (A)

Cellulose

In cellulose, the $CO$ bonds in $\beta$-D-glucoside units are all equatorial which would give a more stable polymeric chain (less steric interaction), whereas in starch the $CO$ bonds in a-D-glucoside units have to be axial if other $CO$ bonds are equatorial. The latter arrangement is less stable than the former because of increased steric interaction.

Hence, the correct option is $\text{A}$