α-D-Glucose and β-D-glucose differ only in the configuration of the –OH group at
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → C1
NCERT (2026-27 edition):
10.1.2.1 Glucose – “The two cyclic hemiacetal forms of glucose differ only in the configuration of the hydroxyl group at C1, called anomeric carbon (the aldehyde carbon before cyclisation). Such isomers, i.e., α-form and β-form, are called anomers.”