JEE Main Chemistry question

Chemistry Biomolecules JEE Main

It is best to carry out reactions with sugars in a neutral or acidic medium, not in an alkaline medium. This is because, in alkaline medium, sugar undergoes one of the following changes:

(A)Decomposition
(B)Inversion
(C)RearrangementCorrect
(D)Racemization

Answer: (C)

Solution

In alkaline medium, sugars undergo base-catalysed enolisation and rearrangement (the Lobry de Bruyn–Van Ekenstein rearrangement), interconverting aldoses and ketoses (e.g., glucose into a mixture including fructose and mannose) and complicating clean reaction

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Question ID VK-151029