Question Detail
Question
What is the product when 2-butyne is treated with excess Br2?
Correct Answer
Option B is the correct answer.
Detailed Explanation
Excess Br2 adds twice to the triple bond: first equivalent gives 2,3-dibromo-2-butene, second equivalent gives 2,2,3,3-tetrabromobutane.
Hint
Two equivalents of Br2 add across the triple bond.