CIE iGCSE Co-Ordinated Science C11.4 Alkanes Exam Style Questions Paper 1
Question
Which statement about alkanes is correct?
(A) They rapidly decolourise aqueous bromine.
(B) They are unsaturated hydrocarbons.
(C) They are used to make polymers.
(D) They can be used as fuels.
▶️Answer/Explanation
Ans: D
Question
Which row describes properties of alkenes?
| structure of molecules | products of complete combustion | |
|---|---|---|
| A | contain only carbon and hydrogen | CO₂ and H₂O |
| B | contain only carbon and hydrogen | CO and H₂O |
| C | contain only single bonds | CO and H₂O |
| D | contain only single bonds | CO₂ and H₂O |
▶️Answer/Explanation
Answer: A) contain only carbon and hydrogen, CO₂ and H₂O
Explanation: Alkenes are hydrocarbons containing carbon-carbon double bonds. When they undergo complete combustion, they produce carbon dioxide (CO₂) and water (H₂O).