Galactose is converted into glucose in

Identify the reagent $R$ used in the following conversion: $\text{Glucose} \xrightarrow{R} n-\text{hexane}$

Which of the following is a correct statement?

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:

When $D^{-}$-glucose is treated with $Br_2$ water,the product is:

Which among the following is a natural biopolymer of monosaccharides?