Biomolecules Question 1
Question: The change in optical rotation, with time, of freshly prepared solution of sugar is known as
[CPMT 1982, 85; BHU 1997]
Options:
A) Rotatory motion
B) Inversion
C) Specific rotation
D) Mutarotation
Show Answer
Answer:
Correct Answer: D
Solution:
$ \underset{(36percent)}{\mathop{\underset{[\alpha ]=+112^{o}}{\mathop{\alpha -D-Glucose}}}} $ ⇌ $ \underset{(0.02percent)}{\mathop{\underset{{{[\alpha ]} _{D}}=+52^{o}}{\mathop{\text{Equilibrium mixture}}}}} $ ⇌ $ \underset{(64percent)}{\mathop{\underset{{{[\alpha ]} _{D}}=+19^{o}}{\mathop{\beta -D-Glucose}}}} $
Glucose has two forms a and b. When either of these two is dissolved in water and allowed to stand, it gets converted to an equilibrium mixture of a and b forms.
BETA
