You should take both structural isomerism and stereoisomerism into account when answering this question. Each carbonyl compound below is treated with $\text{NaBH}_4$. The product from each reaction is then heated with $\text{Al}_2\text{O}_3$ at $600^\circ\text{C}$, forming either a single product or a mixture of isomers. Which carbonyl compound would give the greatest number of isomers?
- Abutanal
- Bbutanone
- Cpentan-3-one
- Dpropanone