Practise O/L exam questions on Introduction to Organic Chemistry with worked solutions
2021 · Paper II · 5 marks
Methane (CH₄) is the simplest hydrocarbon.
(i) Draw the structural formula of methane.
(ii) Write the word equation for the complete combustion of methane in air.
(iii) Name ONE useful product obtained from petroleum refining and state one use of that product.
Show worked solution
(i) H−C−H with four H atoms (tetrahedral around C).
(ii) Methane + Oxygen → Carbon dioxide + Water
CH₄ + 2O₂ → CO₂ + 2H₂O
(iii) Petrol (gasoline) — used as fuel in motor vehicles. (Accept: kerosene / diesel / LPG with correct use.)