Chemistry - Hydrocarbon Question with Solution | TestHub

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$(\mathrm{Ph} - \mathrm{CH} = \mathrm{CH} - {\mathrm{CH}}_3)$ to cis-$(\mathrm{Ph} - \mathrm{CH} = \mathrm{CH} - {\mathrm{CH}}_3)$ are shown in the reaction scheme below.