Addition+Reactions

ADDITION REACTIONS An addition reaction is the "most characteristic" reaction between alkenes and alkynes. It's pretty simple really: "a reactant is added to the two atoms that form the multiple bond." An example: As you can plainly see, the double (or pi) bonds between the carbons were broken to free the electrons, which attach to the bromines. This is when H2 is added to and alkene, which makes an alkane. Addition reactions like these hardly ever happen under normal temperatures and pressures, due to the strong hydrogen-hydrogen bond.
 * Hydrogenation:**



Sources: Brown, LeMay, and Bursten. __Chemistry: The Central Science__. Ninth Ed., pub. 2003. <span style="font-family: Georgia,serif; color: rgb(0, 0, 0)"><span style="font-size: 70%; font-family: Georgia,serif">