In the Rearrangement of 2-Butyne to 1-Butyne, What Causes the Reaction

question 14

Multiple Choice

In the rearrangement of 2-butyne to 1-butyne, what causes the reaction to go to completion?

• A) the increased stability of the terminal triple bond in the product
• B) the high pK_a of ammonia versus the methyl group in 2-butyne
• C) the decreased activation energy for conversion of the allene intermediate to 1 -butyne
• D) the much lower pK_a of the acetylenic proton in the product versus the other species
• E) the increased stability of the 1,2 -butadiene intermediate versus 2 -butyne

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