question_answer

The major product in the reaction of 2-butyne with \[\text{Li/liq}\text{.N}{{\text{H}}_{\text{3}}}\]is

A)  

B)  

C) \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}C{{H}_{3}}\]

D) \[{{H}_{2}}C=CH-C{{H}_{2}}-C{{H}_{3}}\]

Correct Answer: B

Solution :

 Reaction of a non-terminal alkyne with a solution of an alkali metal (usually Na or Li or K) in liquid ammonia give a trans alkene. \[C{{H}_{3}}-C=C-C{{H}_{3}}+2[H]\xrightarrow{\text{Li/liq}\text{.N}{{\text{H}}_{\text{3}}}}\]