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

Compound $A$,$C_5H_{10}O_5$,gives a tetraacetate with $Ac_2O$ and oxidation of $A$ with $Br_2-H_2O$ gives an acid,$C_5H_{10}O_6$. Reduction of $A$ with $HI$ gives isopentane. The possible structure of $A$ is:

Assertion : Maltose is a reducing sugar which gives two moles of $D-$glucose on hydrolysis.
Reason : Maltose has $1,4-\beta-$glycosidic linkage.

$A$ molecule of glucose reacts with $X$ molecules of phenylhydrazine to form osazone. Determine the value of $X$.

Which of the following derivatives is useful for the identification of reducing sugars?

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