question_answer

The major product in the reaction of 2-butyne with Li/liq.\[N{{H}_{3}}\]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. \[C{{H}_{3}}-C\equiv C-C{{H}_{3}}+2[H]\xrightarrow[{}]{Li/liq.\,N{{H}_{3}}}\]