Glycosidic linkage is actually an

In the given three structures,two glucose units are linked. Which of the following correctly identifies the linkages between $C_1$ and $C_4$ and between $C_1$ and $C_6$?

Glucose will show mutarotation when the solvent is

Which of the following structures represents $\alpha-D$-glucose?

Heating glucose with Fehling's solution produces a $.........$ colored precipitate.

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.