What is the most stable conformation of n-butane and why?

Anti conformation is most stable.

• Minimizes steric strain effectively.

• Maximizes distance between groups.

• Enhances overall molecular stability.

Fill in the blank: Cyclopropane has a bond angle of ___ degrees.

60

True or False: The boat conformation of cyclohexane is more stable than the chair conformation.

False. The boat conformation is less stable than the chair conformation due to torsional strain and van der Waals repulsion.

What type of strain primarily affects the stability of the eclipsed conformations of butane?

Eclipsed conformations of butane primarily experience torsional strain and steric strain due to the close proximity of larger substituents.

Riddle: I am a conformation of cyclohexane, resembling a chair, free from angle strain, and the most stable. What am I?

Chair conformation

Fill in the blank: In the twist-boat conformation of cyclohexane, the distance between flagpole hydrogen atoms ___ compared to the boat conformation.

Increases

What is the significance of conformational free energy in substituted cyclohexanes?

Conformational free energy indicates the preference of substituents for equatorial or axial positions, affecting the stability of the molecule.

List the stability order of cyclohexane conformations from most stable to least stable.

Chair > Twist boat > Boat > Half-chair

Explain why cyclopropane is considered unstable despite its planar structure.

Cyclopropane is unstable due to bond angles.

• Bent bond angles cause strain.

• Weak overlap leads to reactivity.

• Prone to electrophilic attack.

What causes the steric strain in the gauche conformations of butane?

Steric strain in the gauche conformations of butane arises from the proximity of the larger methyl groups, causing repulsion between them.