Hydrocarbons and Organic Compounds — O/L Science

How do I practise Hydrocarbons and Organic Compounds?

1 question with a worked solution · 5 marks

1. 2021 · Paper II · 5 marks
   Question 11 opens on methane as the simplest hydrocarbon. It asks you to draw its structural formula, to write the word equation for its complete combustion in air, and to name one useful product of petroleum refining with a use for it.
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   (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.)
   Source: Department of Examinations, Sri Lanka — G.C.E. O/L Science 2021, Paper II, Question 11 · https://doenets.lk/pastpapers

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Grade 11 · Term 1