List of top Chemistry Questions on Haloalkanes and Haloarenes asked in MET

The following reaction is an example of ... reaction.
\(\mathrm{C_2H_4Br_2 \xrightarrow{Alc.\ KOH} C_2H_2}\)

In the reaction sequence,
\(\mathrm{C_2H_5Cl + KCN \xrightarrow{C_2H_5OH} X \xrightarrow{H_3O^+} Y}\),
what is the molecular formula of Y?