91Ó°ÊÓ

The Fischer projection looks like a cross, with the asymmetric carbon atom at the point where the line cross. The horizontal lines are taken to be wedges i.e., bonds that project out towards the viewer. The vertical lines are taken to project away from the viewer, as dashed lines.

Hold the molecule so that,the chiral center (i.e C) is on the plane of the paper,two bonds are coming out of the plane of the paper and are on a horizontal plane,the three remaining bonds are going into the plane of the paper and are on a vertical plane.

Hold the molecule so that the two chiral centers (i.e., C) are on the plane of the paper, four bonds are coming out of the plane of the paper and are on a horizontal plane, and the two remaining bonds are going into the plane of the paper and are on a vertical plane.