Organic Chemistry Introduction Quiz

Grade 10 · Science · Quiz

Assess your knowledge of hydrocarbon classification, functional groups, isomers, and IUPAC nomenclature.

Questions

  1. Which of the following is an unsaturated hydrocarbon?

    1. Methane (CH₄)
    2. Ethane (C₂H₆)
    3. Ethene (C₂H₄)
    4. Propane (C₃H₈)
    Show answer

    Answer: Ethene (C₂H₄)

    Ethene (C₂H₄) contains a C=C double bond, making it unsaturated. Methane, ethane, and propane are alkanes (saturated)

  2. What is the IUPAC name of the compound CH₃-CH₂-CH₂-CH₃?

    1. Propane
    2. Pentane
    3. Butane
    4. Ethane
    Show answer

    Answer: Butane

    CH₃CH₂CH₂CH₃ has 4 carbons in a straight chain — this is n-butane

  3. Which functional group is characteristic of ketones?

    1. -OH
    2. -COOH
    3. C=O (between two carbon atoms)
    4. -NH₂
    Show answer

    Answer: C=O (between two carbon atoms)

    In ketones, the carbonyl group (C=O) is bonded to two carbon atoms (not at the end of the chain); e.g., acetone (CH₃COCH₃)

  4. How many structural isomers does butane (C₄H₁₀) have?

    1. 1
    2. 2
    3. 3
    4. 4
    Show answer

    Answer: 2

    Butane (C₄H₁₀) has 2 structural isomers: n-butane (straight chain) and isobutane (2-methylpropane)

  5. Which property of carbon makes it the basis for organic chemistry?

    1. It can form only ionic bonds
    2. It has 4 valence electrons and can form 4 covalent bonds
    3. It is the most abundant element on Earth
    4. It always forms double bonds
    Show answer

    Answer: It has 4 valence electrons and can form 4 covalent bonds

    Carbon has 4 valence electrons, allowing it to form 4 stable covalent bonds with various atoms, enabling enormous structural diversity

  6. What is the product of the complete combustion of propane (C₃H₈)?

    1. CO + H₂O
    2. CO₂ + H₂O
    3. C + H₂O
    4. CO₂ + H₂
    Show answer

    Answer: CO₂ + H₂O

    Complete combustion: C₃H₈ + 5O₂ → 3CO₂ + 4H₂O. Complete combustion always yields CO₂ and H₂O

  7. Amino acids are organic molecules that contain both an amino group (-NH₂) and a carboxyl group (-COOH).

    Show answer

    Answer: True

    All amino acids contain an amino group (-NH₂) and a carboxyl group (-COOH) attached to the same alpha carbon, plus a variable R group

  8. Large molecules made of repeating monomer units, such as polyethylene and proteins, are called ________.

    Show answer

    Answer: polymers

    Polymers are formed by linking many monomer units together; natural polymers include proteins and DNA; synthetic examples include polyethylene

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