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Quiz Chapter 2: Carbon Compound

10 questions · Form 5 Chemistry Bab 2: Carbon Compound

Question 1 of 10Score: 0

What sweet fruity smelling product is formed when ethanoic acid reacts with ethanol in the presence of concentrated H₂SO₄?

Full Question List & Answer Key

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

1. What sweet fruity smelling product is formed when ethanoic acid reacts with ethanol in the presence of concentrated H₂SO₄?

  1. Ethyl ethanoate
  2. Methyl ethanoate
  3. Ethylethane
  4. Diethyl ether
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Answer: A

Ethanoic acid + Ethanol → Ethyl ethanoate + Water. This process is called esterification.

2. 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.

3. 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).

4. What functional group is present in carboxylic acids?

  1. Hydroxyl group (-OH)
  2. Carboxyl group (-COOH)
  3. Carboalkoxy group (-COO-)
  4. Carbon-carbon double bond (C=C)
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Answer: B

Carboxylic acids contain the carboxyl group (-COOH) as their active functional group.

5. 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.

6. Ethanol can be produced naturally by yeast through which process?

  1. Oxidation
  2. Cracking
  3. Fermentation
  4. Polymerisation
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Answer: C

Yeast ferments glucose in anaerobic conditions at ~37°C to produce ethanol and carbon dioxide.

7. Which compound is an isomer of butane (C₄H₁₀)?

  1. Methylpropane
  2. Methylpropene
  3. Cyclobutane
  4. Dimethylethane
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Answer: A

Butane (C₄H₁₀) has two structural isomers: unbranched butane and branched 2-methylpropane (or methylpropane).

8. Which alcohol has the chemical formula C₃H₇OH?

  1. Methanol
  2. Ethanol
  3. Propanol
  4. Butanol
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Answer: C

Propanol contains 3 carbon atoms (n=3), giving C₃H₇OH.

9. 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.

10. 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).

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