Which of the following pairs give a positive Tollen's test?

To detect the reducing and non-reducing sugars,which of the following tests is used?

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

Which of the following compounds forms starch on polymerization?

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

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: