The Fischer projection of D-Glucose is a two-dimensional representation of this sugar molecule, illustrating its structural features. In this projection, the carbon skeleton of the molecule is drawn vertically, with the most oxidized carbon (the aldehyde group in glucose) located at the top.
D-Glucose specifically refers to the configuration of glucose that is biologically active and is commonly found in nature. In its Fischer projection, you will notice that the hydroxyl (-OH) groups are showing the 3D structure of the molecule from a top-down view. For D-Glucose, the hydroxyl group on the penultimate carbon (the second-to-last carbon) is positioned on the right side, which is a key characteristic in distinguishing it from L-Glucose.
In summary, the Fischer projection of D-Glucose provides a clear view of how the hydroxyl groups and the aldehyde group are arranged around the carbon backbone, making it an important tool for understanding the molecular structure and reactivity of glucose.