Consider both the hydrogenation [high-draw-jen-AY-shun] and the bromination [broh-min-AY-shun] of alkenes using elemental bromine. Which of the following statements concerning these reactions is TRUE?

W) Both reactions are syn-additions

X) Hydrogenation is a syn-addition, but bromination is an anti-addition

Y) Hydrogenation is an anti-addition, but bromination is a syn-addition

Z) Both reactions are anti-additions
X) HYDROGENATION IS A SYN-ADDITION, but Bromination IS AN ANTI ADDITION