Glucose forms many derivatives. The derivative which will help to prove the furanose structure is

Which of the following molecules serves as fibrous content of food only and is useful for bowel movement in humans?

Which of the following saccharides is present in milk?

Which of the following $n$ mole molecules of carbohydrate contains $2n$ mole molecules of galactose,$n$ moles of glucose,and $n$ moles of fructose upon hydrolysis?

The aqueous solution of a carbohydrate gives a dark blue colour with iodine. It is

Glucose + ? $\longrightarrow$ Sucrose