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Quiz Chapter 2: Carbon Compound

10 questions · Form 5 Chemistry Bab 2: Carbon Compound

10 questions · plays in fullscreen

Full Question List & Answer Key

Prefer reading to quizzing? All 10 questions are listed below with the answer and explanation under each one.

1. Name the catalyst used in the industrial manufacture of ethanol from the hydration of ethene.

  1. Phosphoric acid (H₃PO₄)
  2. Nickel (Ni)
  3. Platinum (Pt)
  4. Iron (Fe)
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Answer: A

Ethene reacts with steam at 300°C and 60 atm using phosphoric acid (H₃PO₄) as a catalyst to form ethanol.

2. Which of the following is a saturated hydrocarbon?

  1. Ethene
  2. Propynes
  3. Ethanol
  4. Butane
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Answer: D

Butane is an alkane containing only single carbon-carbon bonds, classifying it as a saturated hydrocarbon.

3. What gas is produced when ethanoic acid reacts with calcium carbonate?

  1. Hydrogen gas
  2. Oxygen gas
  3. Carbon dioxide gas
  4. Sulfur dioxide gas
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Answer: C

Carboxylic acids react with metal carbonates to produce a salt, water, and carbon dioxide gas (CO₂).

4. Which member of the alkane series is the main constituent of natural gas?

  1. Ethane
  2. Propane
  3. Methane
  4. Pentane
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Answer: C

Methane (CH₄) makes up approximately 70-90% of natural gas.

5. What is the general formula for the alkene homologous series?

  1. CₙH₂ₙ
  2. CₙH₂ₙ₊₂
  3. CₙH₂ₙ₋₂
  4. CₙH₂ₙ₊₁OH
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Answer: A

The general formula for alkenes containing one double bond is CₙH₂ₙ where n = 2, 3, 4...

6. Which statement correctly describes a homologous series?

  1. Members have identical physical properties
  2. Members have the same structural formula
  3. Successive members differ by a -CH₂- unit
  4. Members belong to different functional groups
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Answer: C

In any homologous series, each member differs from the next by a constant relative mass unit of -CH₂- (mass = 14).

7. Which reagent and condition can be used to distinguish between hex-1-ene and hexane?

  1. Sodium carbonate powder
  2. Bromine water in the dark
  3. Glacial acetic acid
  4. Litmus paper
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Answer: B

Hex-1-ene rapidly decolorises reddish-brown bromine water without sunlight, whereas hexane shows no change in the dark.

8. What is the IUPAC name for the ester formed from methanol and propanoic acid?

  1. Propyl methanoate
  2. Methyl propanoate
  3. Ethyl propanoate
  4. Methyl ethanoate
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Answer: B

The alcohol provides the alkyl prefix (Methanol → Methyl) and the acid provides the alkanoate suffix (Propanoic acid → Propanoate) = Methyl propanoate.

9. What is the organic product formed when propanol undergoes dehydration using heated porcelain chips?

  1. Propane
  2. Propanoic acid
  3. Propene
  4. Ethyl propanoate
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Answer: C

Dehydration of an alcohol removes water to yield the corresponding alkene. Propanol dehydrates to propene.

10. Which compound turns damp blue litmus paper red and reacts with magnesium to produce hydrogen gas?

  1. Propanone
  2. Propanoic acid
  3. Propanol
  4. Ethyl propanoate
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Answer: B

Propanoic acid is a carboxylic acid, displaying acidic properties by turning blue litmus red and liberating H₂ with magnesium.

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