What are $\alpha - D -$ glucose and $\beta - D -$ glucose to each other?

Which of the following carbohydrates produces double the quantity of glucose on hydrolysis per mole as compared with sucrose?

An organic compound gives a positive result for Molisch's test as well as Benedict's test,but it does not give a positive result for Seliwanoff's test. Most probably,it is:

Identify the carbohydrate structure shown in the image.

Two monomers in maltose are

Glucose or sucrose are soluble in water but cyclohexane or benzene (simple six-membered ring compounds) are insoluble in water. Explain.