Glucose will show mutarotation when the solvent is

$ \alpha-D-Glucose $ and $ \beta-D-Glucose $ are:

Which of the following are reducing sugars?
$I$. Sucrose
$II$. Ribose
$III$. Lactose
$IV$. Fructose

Which of the following represents the anomer of the compound shown?

Considering the facts that
$I$. sucrose forms glycosidic linkage between $C_1$ of glucose and $C_2$ of fructose,while
$II$. lactose forms glycosidic linkage between $C_1$ of galactose and $C_4$ of glucose.
Choose the correct statement.

What is the change in optical rotation with time in a freshly prepared sugar solution called?