Compound X causes warm acidified sodium dichromate(VI) to change from orange to green. When 1 mol of X is reacted with 2 mol of HCN in the presence of KCN. What may X be?
- A$\text{CH}_3\text{CH}_2\text{CH}_2\text{CHO}$
- B$\text{CH}_3\text{COCH}_2\text{COCH}_3$
- C$\text{H}_2\text{C}=\text{CHCH}_2\text{CHO}$
- D$\text{OHCCH}_2\text{CH}_2\text{CHO}$