What is the product formed when glucose reacts with an excess of $C_6H_5-NH.NH_2$?

Identify the glycosidic linkage present in lactose.

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:

$\beta-D-(+)-$Glucopyranose is represented by which of the following structures?

Given below are two statements:
Statement $I:$ Fructose does not contain an aldehydic group but still reduces Tollen's reagent.
Statement $II:$ In the presence of base,fructose undergoes rearrangement to give glucose.
In the light of the above statements,choose the correct answer from the options given below:

Which $L$-sugar on oxidation gives an optically active dibasic acid?