Cho các chất sau: 

Câu hỏi: Cho các chất sau: $$\begin{gathered} C{H}_{3}COOC{H}_3 \left(1\right), \\ C{H}_2=CHCOOCH=C{H}_2 \left(2\right), \\ {C}_6{H}_{5}COOCH=C{H}_2 \left(3\right), \\ C{H}_{2}CHOOC-C_2{H}_5 \left(4\right), \\ HCOO{C}_6{H}_5 \left(5\right), \\ C{H}_2=CHCOOC{H}_2{C}_6{H}_5 \left(6\right) \end{gathered}$$

A. (1), (3), (5), (6)

B. (1), (2), (5),(6)

C. (2), (4), (5), (6)

D. (1), (2), (6)