nmdcat.online
BIO NMDCAT Carbohydrates
nmdcat.online June 27, 2026

The observation that a solution of pure α-D-glucose has a specific rotation of +112°, which slowly changes to +52.7° upon standing, is an example of

A. Epimerization at C-2
B. Mutarotation involving the interconversion of anomers
✓
C. Tautomerization between keto and enol forms
D. Hydrolysis of the ring structure

📝 Explanation

This change in optical rotation is due to mutarotation. α-D-glucose (+112°) undergoes ring opening and reclosing to form an equilibrium mixture of β-D-glucose (+18.7°) and α-D-glucose, with the overall specific rotation settling at +52.7°.

📖 Additional Information

  • Epimerization at C-2
  • Mutarotation involving the interconversion of anomers
  • Tautomerization between keto and enol forms
  • Hydrolysis of the ring structure

This change in optical rotation is due to mutarotation. α-D-glucose (+112°) undergoes ring opening and reclosing to form an equilibrium mixture of β-D-glucose (+18.7°) and α-D-glucose, with the overall specific rotation settling at +52.7°.

🔗 Share This Question

Facebook Twitter LinkedIn WhatsApp

🧭 Navigate Questions

Previous Question

In the formation of the pyranose ring form of D-glucose, the reaction occurs between the carbonyl group on C-1 and the hydroxyl group on

Next Question

Regarding the structure of chitin, the polysaccharide forming the exoskeleton of arthropods, its monomer is a modified glucose where the C-2 hydroxyl is replaced by

Back to All Questions

🔗 Related MCQs

An increase in the incidence of ectopic pregnancies within a population can often be epidemiologically correlated with a prior increase in the prevalence of which sexually transmitted disease?
July 16, 2026
In the life cycle of Herpes Simplex Virus 2 (HSV-2), the virus travels along nerve fibers to reach the sensory ganglia. The cellular mechanism responsible for this retrograde transport utilizes:
July 16, 2026
A defining characteristic of the lesions associated with the secondary stage of syphilis is that they:
July 16, 2026
The causative agent of genital herpes, HSV-2, is enveloped. The biological significance of this viral envelope in the context of transmission is that it makes the virus:
July 16, 2026
The structural basis for the severe cardiovascular complications seen in tertiary syphilis, such as aortic aneurysms, is the chronic inflammation and destruction of:
July 16, 2026

Categories

View all →