Organic compound T contains only a single functional group. The empirical formula of compound T is $\text{C}_2\text{H}_4\text{O}$. Some functional groups are listed below. 1 alcohol 2 aldehyde 3 ester 4 ketone Which functional groups are possible for compound T?
- A1 and 3
- B1 and 4
- C2 and 3
- D2 and 4