Here is the solution to the Organic Chemistry quiz, with explanations for each question:
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1. Organic compounds are compounds contain _________.
✔ Correct Answer: D) C (Carbon)
*Explanation:*
By definition, organic compounds are those that contain carbon atoms bonded to hydrogen and often to other elements like oxygen, nitrogen, sulfur, or halogens. While many organic compounds also contain O, N, or S,
carbon is the essential element that defines an organic compound. The presence of carbon is what distinguishes organic from inorganic chemistry.
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2. Is this hydrocarbon saturated or unsaturated?
*(Structure shown: H₃C–CH₂–CH₃ — propane)*
✔ Correct Answer: B) saturated
*Explanation:*
The structure shown is propane (C₃H₈), which contains only single bonds between carbon atoms. Hydrocarbons with only single bonds are called
saturated hydrocarbons (alkanes). Unsaturated hydrocarbons have double or triple bonds (alkenes or alkynes).
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3. What type of molecule is it?
*(Structure: CH₃–CH(CH₃)–CH₂–C≡C–CH₃)*
✔ Correct Answer: D) alkyne
*Explanation:*
This molecule contains a
carbon-carbon triple bond (C≡C), which is the defining feature of an
alkyne. Alkenes have double bonds, alkanes have only single bonds, and amino acids contain both amine (–NH₂) and carboxylic acid (–COOH) groups — none of which apply here.
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4. Give the name of this compound... C₃H₈
*(Image shows 3 carbon atoms in a chain, each fully saturated with hydrogens — propane)*
✔ Correct Answer: C) Propane
*Explanation:*
C₃H₈ follows the general formula for alkanes: CₙH₂ₙ₊₂. For n=3, we get C₃H₈ →
propane. Propene would be C₃H₆ (alkene), butane is C₄H₁₀, and butyne is C₄H₆.
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5. The molecular formula for Heptane is
✔ Correct Answer: D) C₇H₁₆
*Explanation:*
Heptane is an alkane with 7 carbon atoms. Using the alkane formula CₙH₂ₙ₊₂:
n = 7 → 2(7) + 2 = 16 →
C₇H₁₆
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6. Which of the following elements is required in an organic compound?
*(Icons for H, C, N, O shown)*
✔ Correct Answer: C (Carbon)
*Explanation:*
While hydrogen is almost always present, and oxygen, nitrogen, etc., are common,
carbon is the mandatory element in any compound classified as organic. This is the fundamental definition of organic chemistry.
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✔ Final Answers:
1.
D
2.
B
3.
D
4.
C
5.
D
6.
C
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