JEE Main Chemistry question

If α-D-glucopyranose is reacted with acetic anhydride at 373 K, the major product is the β-isomer of the pentaacetate. It is attributed to

(A)Isomerisation of α-D into β-D-glucose at 373 KCorrect
(B)Opening of the glucopyranose ring
(C)Both the statements are correct
(D)None of the statements is correct

Answer: (A)

Solution

At the elevated temperature of 373 K, the anomeric equilibrium (mutarotation) shifts and favours conversion of the α-anomer into the thermodynamically more stable β-anomer before acetylation occurs, so the final isolated pentaacetate

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Question ID VK-150772