Question

The change in the optical rotation (with time) of freshly prepared solution of sugar is known as

• A. specific rotation
• B. inversion
• C. rotatory motion
• D. mutarotation

Answer 1

The correct option is B inversion

$\text{The change in the optical rotation (with time) of freshly prepared solution of sugar is known as inversion}$

$\alpha -D-Glucose\rightleftharpoons$Equilibrium\ mixture$=\beta -D-Glucose$
$\left[a\right]-+{112}^0$ $\left[\alpha \right]D-{52}^0$ $\left[\alpha \right]D-+{19}^0$
(36%) (0.02%) (64%)
$\text{Glucose has two forms}$ $\alpha$ and $\beta$. $\text{When either of these two is dissolved in water and allowed to stand,}$ $\text{it gets converted to an equilibrium mixture of}$ $\alpha$ and $\beta$ forms.