(i) Ethene into ethane:
Ethene + H₂ → Ethane (Hydrogenation)
(ii) Methane into carbon tetrachloride:
CH₄ + 4Cl₂ → CCl₄ + 4HCl (Chlorination)
(iii) Ethene into glycol:
Ethene + H₂O₂ → Ethylene glycol (In the presence of a catalyst)
(iv) Ethyl chloride into ethane:
C₂H₅Cl + H₂ → C₂H₆ + HCl (Reduction with hydrogen)
(v) Ethyl bromide into ethene:
C₂H₅Br → C₂H₄ + HBr (Dehydrohalogenation in the presence of a base)