Which of the following monosaccharides is a pentose?

In addition to the aldehyde group,glucose contains . . . . . . .

Which of the following reagents cannot distinguish between glucose and fructose?

Heating glucose with methanol in the presence of dry $HCl$ yields $\alpha$ and $\beta$ methyl glucosides. This indicates the presence of which of the following?

The change in optical rotation with time of a freshly prepared solution of sugar is known as:

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