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- Which of the following will not show mutarotation?Option: 1 MaltoseOption: 2 Lactose</d
- #Biomolecules
- #Engineering
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Which of the following will not show mutarotation?
Maltose
Lactose
Glucose
Sucrose
Answers (1)
As we have learnt,
Mutarotation
The change in specific rotation of an optically active compound in solution with time, to an equilibrium value, is called mutarotation, or it is the change in the optical rotation occuring by epimerisation, i.e., the change in the equilibrium between two epimers, when the corresponding stereocentres interconvert.
During mutarotaion, the ring opens and then ring recloses either in the inverted position or in the original position giving a mixture of α and β forms. All reducing carbohydrates, i.e, monosaccharides and disaccharides undergo mutarotation in aqueous solution. Mutarotation proves the existence of anomers and cyclic structures.
Sucrose does not contain a free aldehyde or ketone group. Hence does not show mutarotation.
Hence, the correct answer is Option (3)
