Which of the following compounds is a -aldopentafuranose?

Step-by-step solution

An aldopentafuranose is a five-carbon sugar (pentose) derived from an aldose, forming a five-membered cyclic hemiacetal (furanose) ring. For the sugar to be an aldose, the anomeric carbon (C1) must be bonded to a hydrogen atom (-H) and a hydroxyl group (-OH). If C1 is bonded to a -CH₂ OH group, it is a ketose. For the sugar to be a pentose in a furanose ring, the C4 carbon must be bonded to one -CH₂ OH group and one hydrogen atom, giving a total of five carbon atoms. Evaluating the given structures: In Option (A),