Which of the following is the structure of $\beta-D$-Glucopyranose?

What are the pairs of stereoisomers that differ in configuration at only one carbon atom called?

Identify the non-reducing sugar from the following.

When sucrose is heated with conc. $HNO_3$,the product is:

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

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 $....... \%$.