Electrochemical oxidation of the succinate ion $(1, 4-\mathrm{butanedioate} \mathrm{ion})$ into ethylene proceeds through the formation of the intermediate

 

 

By which reagents alkyne converts to trans alkene and then to dibromobutane? i.e., ${\mathrm{CH}}_3-\mathrm{C}\equiv \mathrm{C} - {\mathrm{CH}}_3\stackrel{\mathrm{R}}{\to } \stackrel{\mathrm{S}}{\to }{\mathrm{C}}_4{\mathrm{H}}_8{\mathrm{Br}}_2 \left(\mathrm{Achiral}\right)$

$\mathrm{R} \text{and} \mathrm{S}$ are, respectively:

Which of the following is the product?

Which of the following statements is/are correct?

Predict product(s) in the following reaction.

Which of the following reactions are correct?