4. Draw the bond-line dash-wedge structure and the Fischer projection of the following compounds. For each compound, draw the Newman Projection down the C2-C3 bond in the lowest energy conformation.

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation: