Question

In Fischer projections,what do vertical and horizontal lines represent? What about intersections?

• A. Vertical - below plane
  Horizontal - above plane
  Intersection - carbon
• B. Vertical - above plane
  Horizontal - below plane
  Intersection - carbon
• C. Vertical - on the plane
  Horizontal - above plane
  Intersection - carbon
• D. Vertical - on the plane
  Horizontal - below plane
  Intersection - carbon

Answer 1

The correct option is A Vertical - below plane

Horizontal - above plane
Intersection - carbon
Writing fisher projections is easier way to represent organic compounds on paper. While writing fisher projections, chiral centre is assumed to be on a plane. The groups that are above the plane are represented on horizonal lines. The groups that are below the plane are represented on vertical lines. The intersection of these horizontal and vertical lines represent the chiral carbon.