Which of the following compounds, on reaction with ${\mathrm{CH}}_3\mathrm{MgBr}$, will give a tertiary alcohol?

Arrange the following compounds according to their boiling points.

What will be the product?

Following compounds are given:

$\left(\mathrm{i}\right)$ ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH}$ $\left(\mathrm{ii}\right)$ ${\mathrm{CH}}_3{\mathrm{COCH}}_3$ $\left(\mathrm{iii}\right)$  $\left(\mathrm{iv}\right)$ ${\mathrm{CH}}_3\mathrm{OH}$

Which of the following can show iodoform reaction?