(a) Arrange the following compounds in the increasing order of their acid strength:
p-cresol, p-nitrophenol, phenol
(b) Write the mechanism (using curved arrow notation) of the following reaction:
${\mathrm{CH}}_2={\mathrm{CH}}_2\stackrel{{\mathrm{H}}_3{\mathrm{O}}^{+}}{⟶}{\mathrm{CH}}_3-{\mathrm{CH}}_2^{+}+{\mathrm{H}}_2\mathrm{O}$

OR

Write the structures of the products when Butan-2-ol reacts with the following:
(a) CrO₃
(b) SOCl₂