Identify $A$ in the following reaction:
$C_6H_{12}O_6 \xrightarrow{\text{dil. } HNO_3} A$

The number of chiral carbons present in sucrose is

Sucrose is dextrorotatory but after hydrolysis the mixture shows laevorotation,this is 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 $....... \%$.

Cellulose is a polymer of

If $\alpha-D-(+)$-glucose is dissolved in water and kept for a few hours,the major constituent$(s)$ present in the solution is (are)