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It looks like this page is from a chemistry textbook discussing hydrocarbons, specifically focusing on the international nomenclature and structure of alkynes. Here’s a breakdown of the content: 1. **Question 3**: Asks to determine the international nomenclature names of certain alkyne compounds given their structural formulas. 2. **Question 4**: Requires writing a structural formula for a given alkyne using its name. 3. **Apply Your Knowledge**: Discusses properties of alkynes and asks you to identify which compound among the given has a non-terminal triple bond and a molar mass of 68 u. Options include: - a) CH₃C≡CCH₃ - b) CH₃CH₂C≡CH - c) CH₃C≡CCH₂CH₃ 4. **Additional Information**: Mentions Mikhail Grigorievich Kuryokov, a prominent figure in chemistry. 5. **Section 7: Aromatic Hydrocarbons or Arenas**: Introduces the topic of aromatic hydrocarbons, suggesting a shift in content focus. Feel free to ask if you need specific help with any part!