Hydrocarbons Quiz
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5 questions, one answer each
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1. What is the functional group found in alkenes but not alkanes?
- A. –OH
- B. –COOH
- C. C=C
- D. –Cl
2. What is the formula of propane?
- A. C3H6
- B. C3H8
- C. C2H6
- D. C4H10
3. A student adds bromine water to two unknown colourless gases, A and B. Gas A decolourises the bromine water, gas B does not. What can be concluded?
- A. A is an alkane, B is an alkene
- B. A is an alkene, B is an alkane
- C. Both are alkenes
- D. Both are alkanes
4. What are the products of complete combustion of butane?
- A. Carbon and hydrogen
- B. Carbon monoxide and water
- C. Carbon dioxide and water
- D. Carbon dioxide and hydrogen
5. Ethene reacts with bromine to form 1,2-dibromoethane. Which statement best explains why this reaction is classified as an addition reaction rather than a substitution?
- A. A hydrogen atom is replaced by a bromine atom
- B. Bromine atoms add across the C=C double bond, converting the unsaturated molecule into a saturated one, with no atoms lost
- C. The reaction produces a gas as a by-product
- D. The reaction only occurs with saturated hydrocarbons