wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

The trans-alkenes are formed by the reduction of alkynes with

A
H2Pd/C,BaSO4
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
SnHCl
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
Na/liq.NH3
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
NaBH4
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is C Na/liq.NH3
Sodium metal in liquid ammonia reduces alkynes with anti stereochemistry to give trans alkenes. The reduction is selectively anti since the vinyl radical formed during reduction is more stable in trans configuration.Sodium atom donates an electron to alkyne which after Habstraction from NH3 forms vinylic radical. Transfer of another electron gives a vinylic anion, which is more stable in trans form. This in turn gives trans-alkene after Habstraction from NH3

flag
Suggest Corrections
thumbs-up
1
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Alkynes - Chemical Properties
CHEMISTRY
Watch in App
Join BYJU'S Learning Program
CrossIcon