How do you explain the absence of aldehyde group in the pentaacetate of D-glucose?

How do you explain the absence of aldehyde group in the pentaccetate of D-glucose?

How do you explain the presence of an aldehydic group in a glucose molecule?

How do you explain the presence of an aldehydic group in a glucose molecule?

How do you explain the presence of an aldehydic group in a glucose molecule?

How do you explain the presence of an aldehydic group in a glucose molecule?

Explain why : (i) Glucose is soluble in water but cyclohexane is not. (ii) Aldehyde group is absent in the pentaacetate of D-glucose.