Identify the sugar molecule involved in polynucleotide formation.

Which of the following is a reducing sugar?

Which of the following phenomena is $NOT$ explained by the open chain structure of glucose?

What are the two forms of $D$-glucopyranose obtained from $D$-glucose called?

$\alpha-D-(+)$-glucose and $\beta-D-(+)$-glucose are

Consider the following reactions:
$(i)$ $\text{Glucose} + ROH$ $\xrightarrow{\text{dry } HCl} \text{Acetal}$ $\xrightarrow{x \text{ eq. of } (CH_3CO)_2O} \text{acetyl derivative}$
$(ii)$ $\text{Glucose}$ $\xrightarrow{Ni/H_2} A$ $\xrightarrow{y \text{ eq. of } (CH_3CO)_2O} \text{acetyl derivative}$
$(iii)$ $\text{Glucose} \xrightarrow{z \text{ eq. of } (CH_3CO)_2O} \text{acetyl derivative}$
$x, y$ and $z$ in these reactions are respectively: