Which of the following molecule on reaction with ${\mathrm{CH}}_3{\mathrm{CH}}_2\stackrel{-}{\mathrm{O}}\stackrel{+}{\mathrm{Na}}$ gives aromatic species?

Arrange the following in the correct order of nucleophilicity in polar protic solvents is:

$\left(\mathrm{I}\right)$ ${\mathrm{CH}}_3-\mathrm{O}-{\mathrm{CH}}_2-{\mathrm{O}}^{\ominus }$

$\left(\mathrm{II}\right)$ $\mathrm{Ph}-{\mathrm{CH}}_2-{\mathrm{O}}^{\ominus }$

$\left(\mathrm{III}\right)$ ${\mathrm{CH}}_3-{\mathrm{O}}^{\ominus }$

$\left(\mathrm{IV}\right)$ ${\mathrm{CH}}_3{\mathrm{CH}}_2-{\mathrm{S}}^{\ominus }$

The correct increasing order of reactivity for the following molecules towards electrophilic aromatic substitution is:

In the following reaction:

The major product is: