Bài 6. Hãy hoàn thành các sơ đồ phản ứng sau:\(C{H_3}CH = O\buildrel {HCN} \over
\longrightarrow A\buildrel {{H_3}O^+,{t^o}} \over
\longrightarrow B\buildrel {{H_2}S{O_4},{t^o}} \over
\longrightarrow {C_3}{H_4}{O_2}\buildrel {xt,{t^o},p} \over
\longrightarrow C\)\(C{H_3}COC{H_3}\buildrel {HCN} \over
\longrightarrow D\buildrel {{H_3}O^+,{t^o}} \over
\longrightarrow
