What type of glycosidic linkages are present in amylose?

When sugar $X$ is boiled with dilute $H_{2}SO_{4}$ in an alcoholic solution,two isomers $A$ and $B$ are formed. $A$ on oxidation with $HNO_{3}$ yields saccharic acid,whereas $B$ is laevorotatory. The compound $X$ is ....... .

What is the number of primary and secondary alcoholic groups respectively present in glucose?

Assertion : In the iodometric titration,starch is used as an indicator.
Reason : Starch is a polysaccharide.

Glucose will show mutarotation when the solvent is

Select the evidence for the open chain structure of glucose.