Identify the compounds [A], [B] and [C] in each of the following reactions.

$\text{C}_2\text{H}_5\text{OH} \xrightarrow{\text{PCl}_5} [\text{A}] \xrightarrow{\text{KCN}} [\text{B}] \xrightarrow{\text{H}_3\text{O}^+} \text{C}_2\text{H}_5\text{COOH} \xrightarrow{\text{NH}_3} [\text{C}]$

$\text{C}_6\text{H}_5\text{OH} \xrightarrow{\text{Zn/dust}} [\text{A}] \xrightarrow[\text{anhy. }\text{AlCl}_3]{\text{CH}_3\text{Cl}} [\text{B}] \xrightarrow[\text{K}_2\text{Cr}_2\text{O}_7 + \text{H}_2\text{SO}_4]{[\text{O}]} [\text{C}]$