Question

When but-$2$-yne is treated with $Na$ in liquid ammonia

• A. cis-2-butene is obtained
• B. trans-2-butene is formed
• C. n-butane is the major product
• D. it rearranges to but-1-yne
• E. there is no reaction

Answer 1

Answer: (B)

When but - $2$ - yne is treated with $Na$ in liquid ammonia, addition of two $H$ - atoms takes place at the triple bonded carbon atoms in trans manner.