D-Glucose reacts with anhydrous methyl alcohol in the presence of dry HCl gas to form:

Step-by-step solution

D-Glucose exists predominantly in its cyclic hemiacetal forms, -D-glucopyranose and -D-glucopyranose. When D-glucose is treated with anhydrous methyl alcohol in the presence of dry HCl gas, a Fischer glycosidation reaction takes place. The acid catalyzes the conversion of the hemiacetal at the anomeric carbon (C-1) into an acetal. During this process, only the anomeric hydroxyl group is replaced by a methoxy ( -OCH₃ ) group. The other hydroxyl groups remain unaffected because they are ordinary alcohols, not hemiace