Which reaction is used to prepare alkynes from alkenes?
Correct Answer: Dehydrohalogenation of vicinal dihalides
- Step 1: Start with an alkene, which is a hydrocarbon with a double bond.
- Step 2: Convert the alkene into a vicinal dihalide by adding two halogen atoms (like Cl or Br) across the double bond.
- Step 3: The vicinal dihalide has two halogen atoms on adjacent carbon atoms.
- Step 4: Perform a reaction called dehydrohalogenation, which means removing the halogen atoms and a hydrogen atom from the vicinal dihalide.
- Step 5: This removal creates a triple bond between the two carbon atoms, resulting in an alkyne.
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