$ 3 \mathrm{ROH}+\mathrm{PCl}_3 \rightarrow 3 \mathrm{RCl}+\mathrm{A} $
$ \mathrm{ROH}+\mathrm{PCl}_5 \rightarrow \mathrm{RCl}+\mathrm{HCl}+\mathrm{B}$
\(3 \mathrm{ROH}+\mathrm{PCl}_3 \longrightarrow 3 \mathrm{RCl}+\mathrm{H}_3 \mathrm{PO}_3\)(A)
\(\mathrm{ROH}+\mathrm{PCl}_5 \longrightarrow \mathrm{RCl}+\mathrm{HCl}+\mathrm{POCl}_3\)(B)
\(A\) and \(B\) are \(\mathrm{H}_3 \mathrm{PO}_3\) and \(\mathrm{POCl}_3\) respectively.
${H_2}C = CHC{H_2}Br\xrightarrow{{NaCN}}Y\xrightarrow[{2.\,{H_3}{O^ + }}]{\begin{subarray}{l}
1.{C_6}{H_5}MgBr\, \\
diethylether
\end{subarray} }Z$