What happens when benzene reacts with ${\mathrm{CHCl}}_3$ in the presence of $\mathrm{NaOH}$?

Here, $\mathrm{Z}$ is:

The reaction: ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{I}+\mathrm{KOH}\left(\mathrm{aq}\right)\to {\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH}+\mathrm{KI}$ is classified as:

What will be the major product in the following reaction,

The rate of the above reaction is fastest when $\mathrm{Z}$ is

Identify the correct order of reactivity in ${\mathrm{S}}_{\mathrm{E}}$ reaction in the following compounds.

$\left(1\right)$    

$\left(2\right)$  

$\left(3\right)$  

$\left(4\right)$