Glucose when heated with \( \mathrm{CH}_{3} \mathrm{OH} \) in presence of dry \( \mathrm{HCl} \)...

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Glucose when heated with \( \mathrm{CH}_{3} \mathrm{OH} \) in presence of dry \( \mathrm{HCl} \) gas gives \( \alpha \) and B-methyl glycosides because of mainly :
(a) a \( \mathrm{CH}_{2} \mathrm{OH} \) group
(b) pyranose structure
(c) five hydroxyl groups
(d) a-CHO group
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