Dabour Hub EGEgyptian Curriculum 2026/2027
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Practice with answers

Point 9 of 9 — Introduction to Organic Chemistry, Wöhler’s Theory and AlkanesQuestion bank: 0 questions (0 with pictures)

09 Practice with answers

  1. Which experiment destroyed the vital-force theory, and in what year? — Wöhler, 1828, preparing urea from ammonium cyanate.
  2. Write the formula of the alkane with 10 carbon atoms. — C₁₀H₂₂ (CₙH₂ₙ₊₂).
  3. Name: CH₃–CH(CH₃)–CH₂–CH₂–CH₃. — 2-methylpentane.
  4. Name: CH₃–CCl₂–CH₃. — 2,2-dichloropropane.
  5. Complete and balance: C₂H₆ + O₂ → — 2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O.
  6. Why is methane collected over water? — Because it is insoluble in water and does not react with it.
  7. What is observed when a burning gas gives soot and carbon monoxide? — Incomplete combustion (limited air).
  8. Distinguish isomers of C₃H₈O. — Propan-1-ol CH₃CH₂CH₂OH and propan-2-ol CH₃CHOHCH₃ (position isomers), plus methoxyethane CH₃–O–C₂H₅ (functional isomer).
  9. Give the reason alkanes are called saturated hydrocarbons. — All carbon–carbon bonds are single covalent bonds, so each carbon carries the maximum number of hydrogens.

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