Which of the following are reducing sugars?
$(A)$ Sucrose,$(B)$ Maltose,$(C)$ Lactose,$(D)$ Fructose

Provide the missing details in the following reactions:
$C_{12}H_{22}O_{11}$ $\xrightarrow{A = (?)} C_6H_{12}O_6$ $\xrightarrow{B = (?)} 2C_2H_5OH + 2CO_2$

How many products are produced respectively when optically pure glucose and fructose are reduced one by one by $NaBH_4$?

Osazone formation involves only $2$ carbon atoms of glucose because of

The optical rotation of the $\alpha$-form of a pyranose is $+150.7^{\circ}$,that of the $\beta$-form is $+52.8^{\circ}$. In solution,an equilibrium mixture of these anomers has an optical rotation of $+80.2^{\circ}$. The percentage of the $\alpha$-form in the equilibrium mixture is $....... \%$.

Identify the reagent that confirms the presence of five $-OH$ groups in glucose.