Compound X turns acidified aqueous potassium manganate(VII) colourless. Compound X has the empirical formula $\text{C}_2\text{H}_5\text{O}$. Several possible structures for X are shown. Which of these structures could be correct for compound X?
- A1, 2 and 3
- B1 only
- C2 and 3 only
- D3 and 4