Question Detail
Question
Starting with 2-butene, which of the following is the best method for preparing 2-butyne?
Correct Answer
Option D is the correct answer.
Detailed Explanation
2-Butene can be converted to 2-butyne by first adding Br2 to give 2,3-dibromobutane, followed by double dehydrohalogenation with excess NaNH2 (strong base) to eliminate two equivalents of HBr, forming the alkyne.
Hint
How can an alkene be converted to an alkyne?