In the following reactions:

 ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}\frac{{\mathrm{ConcH}}_2{\mathrm{SO}}_4}{443 \mathrm{K}}\mathrm{Z}\text{. }$

Identify Z:

Given data : It is given to identify  ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}\frac{{\mathrm{ConcH}}_2{\mathrm{SO}}_4}{443 \mathrm{K}}\mathrm{Z}\text{. }$identify Z from the given options.

Explanation :
Ethyl alcohol is converted to ethylene when conc. ${\mathrm{H}}_2{\mathrm{SO}}_4$ is used to remove water at $443°\mathrm{K}.$
Sulfuric acid is a potent dehydrator. 

Therefore, dehydration occurs when ethanol is treated with sulfuric acid. In other words, it evaporates and ethene is formed.

$C_2{H}_{5}OH\underset{-H_{2}O}{\overset{conc.H_{2}S{O}_4}{\to }}{C}_2{H}_4$

Hence, the correct option  A). $C{H}_2=C{H}_2$.