Which reaction is used to prepare alkynes from alkenes?

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Question: Which reaction is used to prepare alkynes from alkenes?

Options:

Correct Answer: Dehydrohalogenation

Solution:

Dehydrohalogenation of vicinal dihalides can be used to prepare alkynes from alkenes.

Which reaction is used to prepare alkynes from alkenes?

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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