JEE Main 202331 JanuaryMorning Shift
- Exam
- JEE Main
- Year
- 2023
- Date
- 31 January
- Shift
- Morning Shift
- Subject
- Chemistry
- Chapter
- Hydrocarbons
JEE Main 2023 · 31 January · Morning Shift · Chemistry · Hydrocarbons
Choose the correct set of reagents for the following conversion...
Choose the correct set of reagents for the following conversion
trans \left(Ph - CH = CH - {CH}_{3}\right) \to \text{cis}\left(Ph - CH = CH - {CH}_{3}\right)
trans \left(Ph - CH = CH - {CH}_{3}\right) \to \text{cis}\left(Ph - CH = CH - {CH}_{3}\right)
Options
- A
- B
Lindlar Catalyst
- C Lindlar Catalyst
- D{Br}_{2}KOH, {NaNH}_{2}, Na\left({LiqNH}_{3}\right)
Correct answer
B.
Lindlar Catalyst
Step-by-step solution
A trans alkene can be converted to a vicinal dihalide through a halogenation reaction. The vicinal dihalide can undergo double elimination to afford an alkyne. The alkyne can undergo partial reduction to give a cis alkene.
The reagents needed to convert trans to cis- are shown in the reaction scheme below.