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Mutarotation:
1. Due to the presence of asymmetric carbon glucose exhibits optical activity and rotates plane polarized light.
?
2. Optical rotation of a solution containing a –D-glucose is +112? degrees
3. But on standing the rotation decreases and reaches +52.5 degrees and no more change occurs due to equilibrium.
4. ß –D-glucose also exhibits this change in optical rotation when allowed to stand in a solution.
? ?
5. This compound initially show +19 degrees of rotation and it gradually increases to +52.5 degrees.
6. This phenomenon is called as mutarotation.
7. It is due to change of glucose form pyranose ring form to open chain form.
a-D-Glucose ? D –Glucose ? ß-D- Glucose
? ? ?
+120 +52. 5 +19
Pyranose ring form Open chain form Pyranose ring form.
Anganifelix answered the question on May 10, 2018 at 18:14
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