Question

Which one of the following does not exhibit the phenomenon of muta rotation?

• A. (+)-maltose
• B. (+)-lactose
• C. (+)-sucrose
• D. (-)-fructose

Answer 1

The correct option is C

(+)-sucrose

Mutarotation is the process involving a gradual change in optical rotation of either form of carbohydrate in aqueous solution to that of equilibrium mixture the structure of sucrose shows that it does not have free $-CHO$ and $-CO-$ groups. Only monosaccharides and reducing disaccharides exhibit mutarotation. Since sucrose is a non-reducing sugar it does not show mutarotation.