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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!