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Pyranose and Furanose

D - Glucose r...

Question

D - Glucose reacts with anhydrous methyl alcohol in the presence of dry $H C l$ gas to form

2, 3, 4, 5, 6 - penta - O - methyl D - glucose

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α

-methyl D - glucopyranoside

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β

-methyl D - glucopyranoside

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Both (B) and (C)

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Solution

The correct option is D Both (B) and (C)

D-Glucose reacts with anhydrous methyl alcohol in the presence of dry HCl gas to form both α-methyl D-glucopyranoside and β-methyl D-glucopyranoside.

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C H_{3} O H

H C l

α -

β -

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S_{1} :

S_{2} :

S_{3} :

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- C H O

S_{4} :

α - D -

β - D -

M e t h y l -

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Glucose when heated with CH₃OH in presence of dry HCl gas gives glucosides because it contains

[CPMT 1982, 85]

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