Organic Chemistry

1. What is the percentage of carbon found in the Earth’s crust?

  1. 0.025%
  2. 10%
  3. 0.6%
  4. 51%
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Answer: Option A. 0.025%

2. Which one of these is not a carbon-containing compound?

  1. Methane
  2. Glucose
  3. Ethanol
  4. Cinnabar
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Answer: Option D. Cinnabar

3. How much carbon dioxide is there in the Earth’s atmosphere?

  1. 1%
  2. 0.04%
  3. 10%
  4. 0.1%
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Answer: Option B. 0.04%

4. What percentage of the human body is composed of carbon?

  1. 18.5%
  2. 60%
  3. 3.3%
  4. 65%
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Answer: Option A. 18.5%

5. Which of the following statements about carbon compounds is correct?

  1. All carbon compounds are gases at room temperature
  2. Carbon does not bond with other elements
  3. In general bonds of carbon with other elements are covalent bonds
  4. Carbon compounds are exclusively found in living organisms
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Answer: Option C. In general bonds of carbon with other elements are covalent bonds