Q. Which one of the following sets of monosaccharides forms sucrose?
A) α-D-Glucopyranose and β-D-fructopyranose
B) α-D-Galactopyranose and α-D-Glucopyranose
C) α-D-Glucopyranose and β-D-fructofuranose
D) β-D-Glucopyranose and α-D-fructofuranose
Explanation
[Solution from source] Sucrose is formed by a glycosidic link between C1 of α-D-glucopyranose and C2 of β-D-fructofuranose. Fructose occurs as the five-membered furanose ring in sucrose, not as fructopyranose, and galactose is a component of lactose. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.