Account for the following:

Reactivity of $\mathrm{HX}$ with alcohols is in the order $\mathrm{HI}>\mathrm{HBr}>\mathrm{HCl}$

Account for the following:

Ethyl chloride is a gas, whereas ethyl iodide is a liquid at room temperature.

What happens when chlorine is passed through ethyl alcohol?

What happens when ethyl chloride is reacted with sodium ethoxide?

What happens when ethyl bromide is treated with caustic soda?

Complete the following equation:

${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Cl}+\mathrm{KOH}\left(\mathrm{aq}\right)⟶$

Complete the following equation:

$-+{\mathrm{PBr}}_3⟶3{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Br}+-$

Explain ${\mathrm{S}}_{\mathrm{N}}1$ reactions.

Consider the following equations:

(i) ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{Cl}\stackrel{\mathrm{aq}. \mathrm{NaOH}}{⟶}{\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH}$

(ii) ${\left({\mathrm{CH}}_3\right)}_3\mathrm{CCl}\stackrel{\mathrm{aq}. \mathrm{NaOH}}{⟶}{\left({\mathrm{CH}}_3\right)}_3\mathrm{COH}$

Which of these reaction follows ${\mathrm{S}}_{\mathrm{N}}1$ mechanism and which the ${\mathrm{S}}_{\mathrm{N}}2$ mechanism ?