Carbohydrate Structure Pyranose (Glucose) Stability

The video tutorial explores the stability of beta and alpha anomers of glucose, focusing on why beta is more stable due to hydrogen bonding. It explains the process of drawing chair conformations and translating from Haworth projections. The tutorial highlights the importance of understanding axial and equatorial positions in determining stability. The concepts are applicable to other sugars like mannose and ribose, emphasizing the role of hydrogen bonds in stability.

What is the primary reason we focus on D-sugars rather than L-sugars in this context?

• D-sugars have no theoretical basis.

• L-sugars are more stable.

• D-sugars are more commonly observed.

• L-sugars are easier to synthesize.

In the chair conformation of glucose, what is the significance of numbering the carbon atoms?

• It affects the color of the sugar.

• It determines the sweetness of the sugar.

• It ensures consistency in drawing the structure.

• It helps in identifying the type of sugar.

What is the difference between axial and equatorial positions in the chair conformation?

• Axial positions are horizontal, equatorial are vertical.

• Axial positions are vertical, equatorial are at an angle.

• Axial positions are diagonal, equatorial are vertical.

• Axial positions are at an angle, equatorial are horizontal.

Why is the beta anomer of glucose more stable than the alpha anomer?

• Alpha anomer is less soluble in water.

• Beta anomer is less soluble in water.

• Alpha anomer has more hydrogen bonds.

• Beta anomer has more hydrogen bonds.

What role do hydrogen bonds play in the stability of glucose anomers?

• They have no effect on stability.

• They make the alpha anomer more stable.

• They destabilize both anomers.

• They make the beta anomer more stable.

How does the chair conformation help in understanding the stability of glucose anomers?

• It displays the solubility in water.

• It indicates the sweetness level.

• It shows the color of the sugar.

• It reveals the hydrogen bonding patterns.

Which of the following sugars also follows the same stability reasoning as glucose?

• Fructose

• Sucrose

• Mannose

• Galactose

What is the main reason for the equilibrium favoring the beta anomer?

• Higher solubility in water

• Greater hydrogen bonding

• More vibrant color

• Lower molecular weight

In the context of glucose anomers, what is an anomeric carbon?

• A carbon that is always axial

• A carbon that is always equatorial

• A carbon that changes position in different anomers

• A carbon that is not part of the ring

What is the significance of the partial charges on oxygen and hydrogen in glucose?

• They determine the color of glucose.

• They influence the taste of glucose.

• They affect the solubility of glucose.

• They enable hydrogen bonding.