Give balanced equations when:

(a) ethene is burnt in excess of oxygen.

(b) ethene reacts with chlorine gas.

(c) ethene combines with hydrogen chloride.

(d) a mixture of ethene and hydrogen is passed over nickel at 200°C.

(a) ethene is burnt in excess of oxygen.

C₂H₄ + 3O₂ ⟶ 2CO₂ + 2H₂O + heat

(b) ethene reacts with chlorine gas.

$\underset{\text{ ethene}}{\text{C}$2\text{H}4} + \text{Cl}2 \xrightarrow[\text{[inert solvent]}]{\text{CCl}4} \underset{\text{1,2, dichloroethane [ethylene chloride]}}{\text{C}2\text{H}4\text{Cl}_2}

(c) ethene combines with hydrogen chloride.

$\underset{\text{ ethene [ethylene]}}{\text{H}$2\text{C}=\text{C}\text{H}2} + \text{HCl (aq.)}\longrightarrow \underset{\text{chloroethane}}{\text{CH}3\text{CH}2\text{Cl}}

(d) a mixture of ethene and hydrogen is passed over nickel at 200°C.

$\underset{\text{ ethene [ethylene]}}{\text{H}$2\text{C}=\text{C}\text{H}2} + \text{H}2 \xrightarrow[200\degree\text{C}]{\text{Nickle}} \underset{\text{ethane}}{\text{C}2\text{H}_6}