Which carbon atom of glucose,numbered from $C-1$ to $C-6$,converts its functional group to a $-COOH$ group when heated with $Br_2$ water?

Which of the following is not a biopolymer?

Which among the following carbohydrate molecules yields the highest number of galactose molecules when one mole of each is hydrolyzed?

Given below are two statements:
Statement $I$: Sucrose is dextrorotatory. However, sucrose upon hydrolysis gives a solution having a mixture of products. This solution shows laevorotation.
Statement $II$: Hydrolysis of sucrose gives glucose and fructose. Since the laevorotation of glucose is more than the dextrorotation of fructose, the resulting solution becomes laevorotatory.
In the light of the above statements, choose the correct answer from the options given below.

$\beta-D-(+)-$Glucopyranose is represented by which of the following structures?

Identify the sugar molecule involved in polynucleotide formation.