Give equations for the following :

(i) Preparation of acetylene

(ii) Preparation of ethyl alcohol

(iii) Addition of chlorine to ethylene

(iv) Preparation of ethane

(v) Sulphurous acid reacts with bromine.

(i) Preparation of acetylene

$\underset{\text{ calcium carbide}}{\text{CaC}$2} + 2\text{H}2\text{O} \longrightarrow \underset{\text{Calcium hydroxide}}{\text{Ca(OH)}2} + \underset{\text{Acetylene}}{\text{C}2\text{H}_2}\uparrow

(ii) Preparation of ethyl alcohol

$\text{C}$2\text{H}5\text{Cl} + \underset{\text{aqueous}}{\text{KOH}} \xrightarrow{\text{boil}} \underset{\text{ethyl alcohol}}{\text{C}2\text{H}5\text{OH}} + \text{KCl}

(iii) Addition of chlorine to ethylene

(iv) Preparation of ethane

$\underset{\text{sodium propionate}}{\text{C}$2\text{H}5\text{COONa}} + \underset{\text{sodalime}}{\text{NaOH}} \xrightarrow[300\degree \text{C}]{\text{CaO}} \underset{\text{ethane}}{\text{C}2\text{H}6} ↑ + \text{Na}2\text{CO}3

(v) Sulphurous acid reacts with bromine

$\text{H}$2\text{SO}3 + \text{Br}2 + \text{H}2\text{O} \longrightarrow \text{H}2\text{SO}4 + 2\text{HBr}