Test #2 Terms

Question 1

Staggered Configuration

Answer 1

Most stable but lowest energy, 60 or 180 degrees

Question 2

Eclipsed Configuration

Answer 2

Least stable, but highest energy. 0-60 or 60-180 degrees

Question 3

What is the stability hierarchy?

Answer 3

Anti>Gauche>Eclipsed

Question 4

Cyclopropane properties as a chair

Answer 4

Locked in plane, lots of angle strain, eclipsed

Question 5

Cyclobutene properties as a chair

Answer 5

lots of angle strain, slightly folded

Question 6

Cyclopentane

Answer 6

Minimal angle strain (108 vs. 109.5), several eclipsed interactions

Question 7

Cyclohexane

Answer 7

no angle strain, no eclipsed reactions if drawn in a chair.

Question 8

Axial

Answer 8

Same direction as the chair angle

Question 9

Equatorial

Answer 9

Opposite angle as the chair.

Question 10

Do chairs exist in axial or equatorial more?

Answer 10

Equatorial

Question 11

Cis

Answer 11

Same side

Question 12

Trans

Answer 12

Opposite sides

Question 13

Stereoisomer

Answer 13

Same formula, same configuration, different spatial arrangements

Question 14

Constitutional isomers

Answer 14

Same formula, different configuration

Question 15

Enantiomers

Answer 15

Stereoisomers whose molecules are non-super imposable mirror images.

Question 16

Diastereomers

Answer 16

Stereoisomers whose molecules are NOT mirror images

Question 17

Chiral molecule

Answer 17

Molecule that is not superposable on its mirror image

Question 18

Achiral

Answer 18

Superposable on its mirror image

Question 19

Chiral center

Answer 19

4 different groups attached to a C

Question 20

Which is which in R and S being clock or counter clockwise?

Answer 20

R is clockwise
S is counterclockwise

Question 21

Mesocompounds

Answer 21

Compounds that have chiral centers, but are achiral

Question 22

What is the requirement to be a mesocompound?

Answer 22

Has to have an internal plane of symmetry

Question 23

Optically active

Answer 23

Ability to rotate plane polarized light

Question 24

Are chiral molecules optically active or inactive?

Answer 24

Optically active

Question 25

What do enantiomers have to do with plane polarized light?

Answer 25

They have equal, but opposite, specific optical rotations

Question 26

What is the formula and symbols for specific rotation?

Answer 26

[a]= a/c*L where [a] is specific rotation a = observed rotation c is concentration ins g/ml L is pathlength in 1/10 cm

Question 27

If positive for specific rotation

Answer 27

dextrorotary or clockwise

Question 28

If negative for specific rotation

Answer 28

Levorotary or counterclockwise

Question 29

Optically or enantiomerically pure

Answer 29

1 enantiomer

Question 30

Racemic mixture

Answer 30

Equal amounts of 2 enantiomers (optically inactive)

Question 31

When using the EZ system, is e or z on same or opposite side?

Answer 31

Same size: Z Opposite side: E

Question 32

Whats a bronstead acid and base

Answer 32

Acid: proton donor Base: proton receiver

Question 33

Whats a lewis acid and base?

Answer 33

Acid: Electron pair acceptor Base: Electron pair donor.

Question 34

Whats a mechanism?

Answer 34

the detailed movement of electrons using curly arrows?

Question 35

Does a reaction lie towards the bigger or smaller PKA

Answer 35

Weaker acid or higher PKA