Aqueous glucose is fermented using yeast at $37\,^{\circ}\text{C}$ without the presence of air. The principal organic product, X, is then separated by fractional distillation. Next, X is oxidised by heating under reflux with acidified potassium manganate(VII), producing the final product Y. Which substance is Y?
- Aethanoic acid
- Bethene
- Cpropanoic acid
- Dpropene