Cyclohexene, on ozonolysis, followed by a reaction with zinc dust and water, gives compound $\mathrm{E}$. Compound $\mathrm{E}$, on further treatment with aqueous $\mathrm{KOH}$, yields compound $\mathrm{F}$. Compound $\mathrm{F}$ is:

In the following reaction:

${\left({\mathrm{CH}}_3\right)}_2\mathrm{CO}\underset{{\mathrm{H}}_2\mathrm{O}}{\overset{\mathrm{Mg}-\mathrm{Hg}}{\to }}\mathrm{A}\stackrel{{\mathrm{H}}^{+},\mathrm{\Delta }}{⟶}\mathrm{B}$,
$\mathrm{A}$ and $\mathrm{B}$ are, respectively:

Which of the following is the correct order of the esterification of the following acids with ${\mathrm{CH}}_3\mathrm{OH}$:

I 

II 

III 

IV 

Give the order of ease of the esterification of the following acid:

I 

II 

III 

IV