Table of contents

1. Matter and Measurements4h 31m
2. Atoms and the Periodic Table5h 23m
3. Ionic Compounds2h 18m
4. Molecular Compounds2h 18m
5. Classification & Balancing of Chemical Reactions3h 17m
6. Chemical Reactions & Quantities2h 27m
7. Energy, Rate and Equilibrium3h 46m
8. Gases, Liquids and Solids3h 25m
9. Solutions4h 10m
10. Acids and Bases3h 29m
11. Nuclear Chemistry56m
BONUS: Lab Techniques and Procedures1h 38m
BONUS: Mathematical Operations and Functions47m
12. Introduction to Organic Chemistry1h 34m
13. Alkenes, Alkynes, and Aromatic Compounds2h 12m
14. Compounds with Oxygen or Sulfur1h 6m
15. Aldehydes and Ketones1h 1m
16. Carboxylic Acids and Their Derivatives1h 11m
17. Amines39m
18. Amino Acids and Proteins1h 51m
19. Enzymes1h 37m
20. Carbohydrates1h 41m
21. The Generation of Biochemical Energy2h 8m
22. Carbohydrate Metabolism2h 22m
23. Lipids2h 26m
24. Lipid Metabolism1h 45m
25. Protein and Amino Acid Metabolism1h 37m
26. Nucleic Acids and Protein Synthesis2h 54m

20. Carbohydrates

Enantiomers vs Diastereomers

GOB Chemistry

20. Carbohydrates

Enantiomers vs Diastereomers

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Multiple Choice

Draw the enantiomer of given structure of Xylose, and identify as D or L.

D-Xylose

L-Xylose

D-Xylose

L-Xylose

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Verified step by step guidance

Identify the given structure of Xylose. In the images provided, you have both D-Xylose and L-Xylose structures.

Understand that enantiomers are mirror images of each other. They have the same molecular formula but differ in the spatial arrangement of atoms.

To draw the enantiomer, you need to invert the configuration at each chiral center. For D-Xylose, the hydroxyl groups (OH) on the right side will be flipped to the left side for L-Xylose, and vice versa.

Examine the configuration of the hydroxyl groups in the given structure. If the hydroxyl group on the last chiral center (furthest from the aldehyde group) is on the right, it is a D-sugar. If it is on the left, it is an L-sugar.

Draw the enantiomer by flipping the positions of the hydroxyl groups at each chiral center. Then, identify the sugar as D or L based on the position of the hydroxyl group on the last chiral center.