JEE Main Chemistry question

[AIEEE 2011] The change in the optical rotation of a freshly prepared solution of glucose is known as

(A)Tautomerism
(B)Racemization
(C)Specific rotation
(D)MutarotationCorrect

Answer: (D)

Solution

A freshly prepared solution of pure α- or β-D-glucose shows a specific rotation that gradually changes over time and settles to an equilibrium value (+52.6°) as the α- and β-pyranose anomers interconvert through the open-chain form; this spontaneous change in optical rotation is called mutarotation. It is not

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Question ID VK-150600