The rapid interconversion of $\alpha-D$-glucose and $\beta-D$-glucose in solution is known as:

Glucose $\xrightarrow{HCN} A$ $\xrightarrow{Hydrolysis} B$ $\xrightarrow{HI, \Delta} C$. What is the final product $C$?

On hydrolysis,sucrose gives:

The molecular formula of the pentahydroxy acid obtained when glucose is oxidized with $Br_2$ water is:

Given below are two statements. One is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: Amylose is insoluble in water.
Reason $R$: Amylose is a long linear molecule with more than $200$ glucose units.
In the light of the above statements,choose the correct answer from the options given below.

Sucrose is