Lesson 5: Stereochemistry

Question 1

the branch of chemistry concerned with the three dimensional arrangement of atoms and molecules and the effect of this on chemical reaction

Answer 1

Stereochemistry

Question 2

Same molecular formula

Answer 2

Isomers

Question 3

Different connectivity of atoms

Answer 3

Constitutional

Question 4

Different functional groups

Answer 4

Functional

Question 5

Different positions of functional group

Answer 5

Positional

Question 6

Different carbon skeleton

Answer 6

Skeletal

Question 7

Same connectivity but different spatial orientation of atoms

Answer 7

Stereoisomers

Question 8

Non- inconverting

Answer 8

Configurational

Question 9

Not result of rotation about single bonds

Answer 9

Configurational

Question 10

Result from restricted rotation around a double bond or on
polysubstituted cyclic alkanes

Answer 10

Geometric

Question 11

Around a chiral carbon

Answer 11

Optical

Question 12

Non superimposable mirror images

Answer 12

Enantiomers

Question 13

Nonmirror images

Answer 13

Diastereomers

Question 14

Interconverting spatial arrangements of atoms

Answer 14

Conformational

Question 15

The result of rotation about single bomds

Answer 15

Conformational

Question 16

The same compound

Answer 16

Conformational

Question 17

Staggered and eclipsed

Answer 17

Aliphatic alkanes

Question 18

Chair and boat

Answer 18

Alicyclic alkanes

Question 19

Chiral - from the greek word “___” meaning ____

Answer 19

Cheir ; hand

Question 20

Has a non-superimposable mirror image

Answer 20

Chiral molecule

Question 21

Asymmetrical

Answer 21

Chiral

Question 22

Has a superimposable mirror image

Answer 22

Achiral molecules

Question 23

Symmetrical

Answer 23

Achiral

Question 24

Has at least one plane of symmetry

Answer 24

Achiral molecules

Question 25

An atom connects to 4 different groups.

Answer 25

Stereocenters / asymmetric centers

Question 26

Stereocenters cause ________

Answer 26

Chirality

Question 27

_______ cause chirality

Answer 27

Streocenters / Asymmetric centers

Question 28

Stereoisomers with one asymmetric center

Answer 28

Enantiomers

Question 29

Molecules that are nonsuperimposable mirror images of each other

Answer 29

Enantiomers

Question 30

Toward the viewer

Answer 30

Horizontal lines

Question 31

Away from the viewer

Answer 31

Vertical lines

Question 32

Absolute configuration AKA

Answer 32

Cahn-Ingold-Prelog system

Question 33

R for

Answer 33

Rectus

Question 34

S for

Answer 34

Sinister

Question 35

Oscillates in one plane

Answer 35

Plane-polarized light

Question 36

Light rays oscillate in all directions

Answer 36

Normal light

Question 37

Light rays oscillate in a single direction

Answer 37

Plane-polarized light

Question 38

Chiral molecules rotate plane-polarized light and achiral molecules do not

Answer 38

True

Question 39

Achiral molecules are optically active because of there ability to rotate plane-polarized light

Answer 39

False ; chiral

Question 40

____ molecules are optically inactive

Answer 40

Achiral

Question 41

If a chiral molecule rotates the plane of polarization clockwise/to the right, the compound is said to be _________, indicated by the prefix

Answer 41

dextrorotatory ; +

Question 42

If a chiral molecule rotates the plane of polarization counterclockwise/to the left, the compound is said to be ________, indicated by the prefix

Answer 42

levorotatory ; -

Question 43

Enantiomers have the same properties except for

Answer 43

Optical activity / Direction of rotation

Question 44

equimolar mixture of 2 enantiomers

Answer 44

Racemic mixture

Question 45

_______ ______ does not rotate plane-polarized light because of the presence of both enantiomers

Answer 45

Racemic mixture

Question 46

stereoisomers that are not mirror images of each other

Answer 46

Diastereomers

Question 47

For a molecule with n stereocenters, the maximum number of stereoisomers possible is

Answer 47

2^n

Question 48

Each ______ _____ has an R and S configuration

Answer 48

Chiral center

Question 49

Achiral compounds (optically inactive) but contain chirality centers

Answer 49

Meso compounds

Question 50

Hint to spot meso compounds

Answer 50

• 2 chiral centers • Four atoms or groups bonded to one asymmetric center are identical to the four atoms or groups bonded to the other asymmetric center