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Treatment of 2-butyne with sodium metal in liquid ammonia (Birch reduction) produces which of the foHydrocarbons Chemistry Question

Question

Treatment of 2-butyne with sodium metal in liquid ammonia (Birch reduction) produces which of the following as the major product?

Answer: A

💡 Solution & Explanation

Birch reduction ($Na / \text{liq. } NH_3$) proceeds via a radical anion mechanism, causing anti-addition of hydrogen to yield strictly the thermodynamically more stable trans-alkene.

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