Aldoses Can Form Which Type of Cyclic Structure

Question

Aldoses can form which type of cyclic structure?
A) Hemiacetal
B) Hemiketal
C) Both hemiacetal and hemiketal
D) Neither hemiacetal and hemiketal

Accepted Answer

Aldoses can form hemiacetal structures when the carbonyl group (C=O) reacts with a hydroxyl group (-OH) on the same molecule to form a cyclic ring. Hemiketals, on the other hand, form when the carbonyl group reacts with a hydroxyl group on a different molecule. Therefore, option A is the correct answer as aldoses can form hemiacetal structures.