The value of $n$ in the formula $(C_5H_{10}O_5)_n$ for inulin is about

Which one of the following statements is correct?

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.

Identify the sugar molecule involved in polynucleotide formation.

Given below are two statements :
Statement $I :$ $D$-glucose pentaacetate does not react with $2,4$-dinitrophenylhydrazine.
Statement $II :$ Starch,on heating with dilute sulfuric acid at $393 \ K$ and $2-3 \ \text{atmosphere}$ pressure,produces glucose.
In the light of the above statements,choose the correct answer from the options given below.

Find the number of optical isomers for the compound $CHO-CH(OH)-CH(OH)-CH(OH)-CH(OH)-CH_2OH$.