What are $\beta - D - \text{glucose}$ and $\beta - D - \text{galactose}$ known as in relation to each other?

Which one of the following compounds will form an osazone derivative?

Match List-$I$ with List-$II$:

List-$I$	List-$II$
$(a)$. Sucrose	$(i)$. $\beta-D$-Galactose and $\beta-D$-Glucose
$(b)$. Lactose	$(ii)$. $\alpha-D$-Glucose and $\beta-D$-Fructose
$(c)$. Maltose	$(iii)$. $\alpha-D$-Glucose and $\alpha-D$-Glucose

Choose the correct answer from the options given below:

From the following, the correct statements about polysaccharides are:
$(I)$ Starch is a polymer of $\alpha-D(+)$-glucose.
$(II)$ Amylose component of starch is not soluble in water.
$(III)$ Amylose is a branched chain polymer of $\alpha-D(+)$-glucose.
$(IV)$ Cellulose is a straight chain polymer of $\beta-D(+)$-glucose units.

What is the molecular formula of glyceraldehyde?

The sugar present in milk is