Cyclohexane Conformations and Stability

The video tutorial explains the bond angles and conformations of cyclohexane, focusing on the chair conformation and the distinction between axial and equatorial hydrogen positions. It highlights the importance of these positions in molecular stability and substitution preferences. The tutorial also compares the structures of cellulose and starch, noting the differences in their glucose ring bonds. Finally, it discusses the stability of chair conformations and the effects of bond flipping.

What is the primary conformation adopted by cyclohexane?

• Planar conformation

• Chair conformation

• Twist-boat conformation

• Boat conformation

In cyclohexane, which type of hydrogen points straight up or down?

• Planar hydrogen

• Axial hydrogen

• Equatorial hydrogen

• Diagonal hydrogen

What happens to the stability of cyclohexane when substituents are added to equatorial positions?

• Stability decreases

• Stability remains unchanged

• Stability increases

• Stability becomes unpredictable

What is the significance of axial and equatorial positions in cyclohexane?

• They have no significance

• They affect the molecule's reactivity

• They determine the molecule's weight

• They determine the color of the molecule

Which of the following is a key difference between cellulose and starch?

• Cellulose has equatorial bonds, starch has axial

• Starch has equatorial bonds, cellulose has axial

• Starch has more glucose units

• Cellulose has more glucose units

What is the main reason chair conformations are more stable than other conformations?

• They have fewer hydrogen atoms

• They have optimal bond angles

• They have less steric hindrance

• They have more carbon atoms

What is the effect of bond eclipsing in cyclohexane conformations?

• Decreases stability

• Only affects axial bonds

• Has no effect on stability

• Increases stability

Which conformation is less stable due to bond eclipsing?

• Half-chair conformation

• Twist-boat conformation

• Boat conformation

• Chair conformation

During chair flipping, what happens to equatorial bonds?

• They become planar

• They disappear

• They remain equatorial

• They become axial

What is the result of a chair flip in cyclohexane?

• The molecule becomes planar

• The molecule becomes unstable

• The molecule breaks apart

• Axial and equatorial positions swap