Conformations of Alkanes and Cycloalkanes

Which one of the following will exhibit conformational isomerism?

• Ethylene

• methane

• chloromethane

• propane

Most stable conformation of cyclohexane is

• chair

• boat

• twist boat

• half chair

The energy barrier for rotation of C-C bond in ethane is

• 4 kcal/mol

• 5 kcal/mol

• 3 kcal/mol

• 2 kcal/mol

Which of the following compound has gauche as it stable conformer?

• n-butane

• n-propane

• 1,2-dicloroethane

• 1,2-dihydroxyethane

Which of the following shows syn /anti isomerism?

• azo compounds

• oximes

• hydrazines

• amines

Which of the two is more stable ?

• Equatorial

• Axial

• Both are equal

The most unstable conformer in cyclohexane?

• Boat

• Chair

• Twist boat

• half chair

Which of the following conformers is not a transition state?

• Boat

• half chair

• fully eclipsed

• twist boat

Which other factor along with torsion decide the stability of conformer?

• Intermolecular hydrogen bonding

• Intramolecular hydrogen bonding

• coordinate bonding

• ionic bonding

Identify the conformation

• Boat

• Chair

• twist boat

• half chair