Q. The major product in the reaction of 2-butyne with Li/liq. $NH_{3}$ is
A) [image:13_image110.emf]
B) [image:13_image111.emf]
C) $CH_{3}CH_{2}CH_{2}CH_{3}$
D) $H_{2}C = CH - CH_{2} - CH_{3}$
Explanation
(b)
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.
$CH_{3} - C \equiv C - CH_{3} + 2\lbrack H\rbrack\overset{\frac{Li}{liq.NH_{3}}}{\rightarrow}$
[image:13_image274.emf]
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.