Problems and exercisesConformations (Rotamers)
Draw Newman projections of the conformers of ethane, propane, and 2-methylpropane, as well as their expected conformational energy profiles.
What isomeric relationship exists between the structures shown?
A) they are not isomeric
B) conformational isomers
C) cis-trans isomers
D) structural isomers
E) rotamers
F) both B and D
G) both B and E
Which answers are correct for the structures shown?
A) they are not isomeric
B) conformational isomers
C) non-superimposable object and mirror image
D) object and mirror image interconvertible by rotation about the central bond
E) all of the above
F) all of the above except A
Carry out the conformational analysis of 2-methylbutane.
Among the conformers of butane, say which statements are correct:
A) only gauche conformations are energy minima
B) the eclipsed ones are low in energy
C) the gauche and anti conformations are energy minima
D) the conformation with the eclipsed methyl groups is the highest in energy
F) the anti conformation is the lowest in energy
G) all of the above except B