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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. 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...

3. 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.

4. 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.

5. 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.

6. 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.

7. 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.

8. 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).

9. 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).

10. What type of reaction occurs when methane reacts with chlorine gas under ultraviolet light?

  1. Addition reaction
  2. Substitution reaction
  3. Esterification reaction
  4. Fermentation reaction
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Answer: B

Alkanes undergo free-radical substitution reactions with halogens in the presence of UV light.

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