Exam 2

higher

The higher the molecular weight, the ________ the boiling point.

Enantiomers

Opposite configurations at ALL chiral centers

Diastereomers

OPPOSITE configurations at SOME chiral centers, the SAME at others

Identical

SAME configuration at ALL chiral centers

lower

If same molecular weight, then the more branching there is the ______ the boiling point.

Down

In a chair confirmation, the dashed wedge is facing ______.

Equatorial

Which is more stable in chair confirmations:

Axial or equatorial?

Anti

Methyl groups are farthest apart

Equatorial

We want bigger groups to be in ______ position in a chair confirmation.

Gauche

Methyl groups with an increase energy of molecule

Anti

Which confirmation is the MOST stable & LOWEST in energy?

Super-eclipsed

Confirmation group with the HIGHEST in energy

• 2 LARGEST groups are lined up

• Unstable

Less

In terms of heat of combustion:

HIGH energy, _____ stable.

more

In terms of heat of combustion:

Low energy, _____ stable.

Solid wedge

Solid or dashed wedge?

Coming AT you & points RIGHT

Dashed

Solid or dashed wedge?

Coming AWAY from you & points LEFT

Solid wedge

Which wedge points to the right?

4 kJ/mol

energy of:

H/H

6 kJ/mol

Energy of:

H/CH3