Answer
The first molecule is an enantiomer of the original molecule because it is an mirror image but non-superimposable with the original. The second molecule is also an enantiomer because as the horizontal and vertical groups switch places, the groups that are coming out of the page become groups that go into the page.
Work Step by Step
The 3rd molecule is the same as the original because it is simply the original molecule rotated 180 degrees.
