Draw the product of the hydrogenation of 2-butyne. draw all hydrogen atoms.

Product:

                     H    H
                     |      |
CH3 - CH2 - C - CH
                     |      |
                     H    H

Explanation:

This is a typical hydrogenation of alkynes. Two of the bonds of the triple bond split and four hydrogen atoms are addet to the molecule, two to each carbon that were bonded by the triple bond.