Test #2

Question 1

stereoisomers

Answer 1

same molecular formula, connectivity but different arrangement of atoms, cannot be converted without breaking bonds

Question 2

enantiomers

Answer 2

nonsuperposable mirror images or chiral molecules

Question 3

chirality center

Answer 3

asymmetrically substituted atoms in a molecular structure, most common=chiral carbon

Question 4

chiral

Answer 4

tetrahedral carbon bearing four substituents

Question 5

diastereomers

Answer 5

stereoisomers which are not enantiomers

Question 6

meso compounds

Answer 6

symmetric/achiral that contain stereo centers, NOT STEREOISOMERS since they are identical

Question 7

racemic mixture

Answer 7

mixture consisting of equal amounts of enantiomers, no optical activity

Question 8

Relationship between symmetry and chirality

Answer 8

asymmetric=chiral, symmetric=achiral

Question 9

relationship between objects and mirror images

Answer 9

symmetric=superosable

Question 10

chiral or achiral? hand

Answer 10

chiral

Question 11

chiral or achiral? screw

Answer 11

chiral

Question 12

chiral or achiral? erlenmeyer flask

Answer 12

achiral

Question 13

chiral or achiral? clock face

Answer 13

chiral

Question 14

chiral or achiral? rectangle

Answer 14

achiral

Question 15

chiral or achiral? parallel ogram

Answer 15

achiral

Question 16

chiral or achiral? letter A

Answer 16

achiral

Question 17

chiral or achiral? helix

Answer 17

chiral

Question 18

chiral or achiral? the letter R

Answer 18

chiral

Question 19

propane

Answer 19

C3

Question 20

Butane

Answer 20

C4

Question 21

Pentane

Answer 21

C5

Question 22

anti conformation

Answer 22

does not have torsional strain from steric hindrance because groups are staggered and methyl groups are far apart MOST STABLE

Question 23

gauche

Answer 23

close enough to each other that the dispersion forces between them are repulsive

Question 24

axial bonds

Answer 24

perpendicular to the average plane of the ring

Question 25

equatorial

Answer 25

those that extend from perimeter of the ring

Question 26

trans

Answer 26

if one is connected by an upper bond and the other by a lower bond

Question 27

cis

Answer 27

both connected by upper bonds or if both are connected by lower bonds

Question 28

heptane

Answer 28

c7

Question 29

cis

Answer 29

both connected by upper bonds or if both are connected by lower bonds

Question 30

dihedral

Answer 30

angle formed between two bonds on neighboring atoms in a Newman projection

Question 31

eclipsed

Answer 31

conformation where bonds have dihedral angles of zero degrees MAXIMIZES ENERGY

Question 32

steric hindrance

Answer 32

repulsion between the electron clouds on bulky groups of a molecule or between molecules

Question 33

Syn

Answer 33

steric hindrance between terminal methyl groups in a system of at least five carbon centers. describing groups oriented in same direction

Question 34

torsional strain

Answer 34

resistance to rotation about a single bond caused by steric hindrance of eclipsing interactions

Question 35

torsional energy

Answer 35

energy it takes to overcome torsional strain, difference between eclipsed and staggered

Question 36

torsional energy

Answer 36

energy it takes to overcome torsional strain, difference between eclipsed and staggered

Question 37

consitutional isomer

Answer 37

same molecule different connectivity COUNT CARBONS