Butanoic acid may be made from 1-bromopropane by using reagents X and Y, as illustrated: 1-bromopropane $\xrightarrow{\text{reagent X}}$ compound Q $\xrightarrow{\text{reagent Y}}$ butanoic acid. Which reagents could X and Y be?
- AX: KCN in ethanol; Y: $\text{HCl(aq)}$
- BX: KCN in ethanol; Y: $\text{NaOH(aq)}$
- CX: $\text{NH}_3$ in ethanol; Y: $\text{HCl(aq)}$
- DX: $\text{NaOH(aq)}$; Y: $\text{H}^+/\text{Cr}_2\text{O}_7^{2-}\text{(aq)}$