Question

Glucose when heated with CH₃OH in presence of dry HCl gas gives α- and β-methyl glucosides because it contains 

(a) An aldehyde group 

(b) A-CH₂OH group 

(c) A ring structure 

(d) Five hydroxyl groups

Answer 1

(c) A ring structure 

Glucose reacts with methanol, in presence of dry HCl, to form alpha and beta methyl glycosides.

Formation of alpha and beta methyl glycosides is due to the ring structure of glucose, as the methyl alcohol can attack the anomeric carbon in 2 ways, leading to these two configurations.