Chapter 15 Chirality

Question 1

Answer 1

Question 1

Degree of Unsaturation C6 H12 {{ ______ }}

Answer 1

Degree of Unsaturation C6 H12 [[((2*6 + 2) - 12 )/2 = 1 degree of unsaturation]]

Question 1

Electromagnetic radiation vibrating in only parallel planes is said to be {{ ______ }}.

Answer 1

Electromagnetic radiation vibrating in only parallel planes is said to be [[plane polarized]].

Question 2

Each member of a pair of enantiomers rotates the plane of polarized light; for this reason, each enantiomer is said to be {{ ______ }}.

Answer 2

Each member of a pair of enantiomers rotates the plane of polarized light; for this reason, each enantiomer is said to be [[optically active]].

Question 2

A {{ ______ }} compound is indicated by a plus sign in parentheses

Answer 2

A [[dextrorotatory]] compound is indicated by a plus sign in parentheses

Question 2

If one enantiomer is dextrorotatory, the other is levorotatory. Thus, racemic mixtures (as well as {{ ______ }}) don’t display optical activity.

Answer 2

If one enantiomer is dextrorotatory, the other is levorotatory. Thus, racemic mixtures (as well as [[achiral compounds]]) don’t display optical activity.

Question 3

A polarimeter consists of a light source emitting unpolarized light, a polarizer, {{ ______ }}, and a sample tube.

Answer 3

A polarimeter consists of a light source emitting unpolarized light, a polarizer, [[an analyzer]], and a sample tube.

Question 5

{{ ______ }} are stereoisomers that are not mirror images

Answer 5

[[diastereomers]] are stereoisomers that are not mirror images

Question 6

{{ ______ }}, the instrument used to detect optical activity

Answer 6

[[a polarimeter]], the instrument used to detect optical activity

Question 8

Answer 8

Question 9

Answer 9

Question 10

Answer 10

Question 11

{{ ______ }} mixture is A mixture of equal amounts of two enantiomers

Answer 11

[[Racemic]] mixture is A mixture of equal amounts of two enantiomers

Question 12

When a solution of an optically active compound rotates the plane {{ ______ }}, we say it is dextrorotatory.

Answer 12

When a solution of an optically active compound rotates the plane [[clockwise]], we say it is dextrorotatory.

Question 12

When a solution of an optically active compound rotates the plane clockwise, we say it is {{ ______ }}.

Answer 12

When a solution of an optically active compound rotates the plane clockwise, we say it is [[dextrorotatory]].

Question 13

When a solution of an optically active compound rotates the plane counterclockwise, we say it is {{ ______ }}.

Answer 13

When a solution of an optically active compound rotates the plane counterclockwise, we say it is [[levorotatory]].

Question 14

Chymotrypsin has 251 stereocenters. The maximum number of stereoisomers possible is [____].

Answer 14

Chymotrypsin has 251 stereocenters. The maximum number of stereoisomers possible is 2²⁵¹

Question 15

Chymotrypsin has [____] stereocenters. The maximum number of stereoisomers possible is 2²⁵¹.

Answer 15

Chymotrypsin has 251 stereocenters. The maximum number of stereoisomers possible is 2²⁵¹.

Question 16

If one enantiomer is dextrorotatory, the other is levorotatory. Thus, racemic mixtures (as well as achiral compounds) {{ DO // DON’T }} display optical activity.

Answer 16

If one enantiomer is dextrorotatory, the other is levorotatory. Thus, racemic mixtures (as well as achiral compounds) [[don’t]] display optical activity.

Question 17

The number of degrees by which an optically active compound rotates the plane of polarized light is called its {{ ______ }} and is given the symbol [α].

Answer 17

The number of degrees by which an optically active compound rotates the plane of polarized light is called its [[specific rotation]] and is given the symbol [α].

Question 17

A {{ ______ }} consists of a light source emitting unpolarized light, a polarizer, an analyzer, and a sample tube.

Answer 17

A [[polarimeter]] consists of a light source emitting unpolarized light, a polarizer, an analyzer, and a sample tube.

Question 19

Answer 19

Question 20

Degree of Unsaturation C5 H8 Br2 {{ ______ }}

Answer 20

Degree of Unsaturation C5 H8 Br2 [[( (2*5 + 2) - 8 -2 )/2 = 1 degree of unsaturation]]

Question 21

A polarimeter consists of a light source emitting unpolarized light, a polarizer, an analyzer, and {{ ______ }}.

Answer 21

A polarimeter consists of a light source emitting unpolarized light, a polarizer, an analyzer, and [[a sample tube]].

Question 22

Degree of Unsaturation C5 H11 N3 {{ ______ }}

Answer 22

Degree of Unsaturation C5 H11 N3 [[((2*5 + 2) - (11 - 3) )/2 = 2 degrees of unsaturation]]

Question 23

Degree of Unsaturation C7 H8 Br N3 O2 {{ ______ }}

Answer 23

Degree of Unsaturation C7 H8 Br N3 O2 [[((2*7 + 2) - 8 - 1 + 3 )/2 = 5 degrees of unsaturation]]

Question 24

If one enantiomer is dextrorotatory, the other is levorotatory. Thus, {{ ______ }} (as well as achiral compounds) don’t display optical activity.

Answer 24

If one enantiomer is dextrorotatory, the other is levorotatory. Thus, [[racemic mixtures]] (as well as achiral compounds) don’t display optical activity.

Question 25

When a solution of an optically active compound rotates the plane {{ ______ }}, we say it is levorotatory.

Answer 25

When a solution of an optically active compound rotates the plane [[counterclockwise]], we say it is levorotatory.

Question 26

A polarimeter consists of a {{ ______ }}, a polarizer, an analyzer, and a sample tube.

Answer 26

A polarimeter consists of a [[light source emitting unpolarized light]], a polarizer, an analyzer, and a sample tube.

Question 28

Degree of Unsaturation C5 H6 {{ ______ }}

Answer 28

Degree of Unsaturation C5 H6 [[((2*5 + 2) - 6 )/2 = 3 degrees of unsaturation]]

Question 29

The number of degrees by which an optically active compound rotates the plane of polarized light is called its specific rotation and is given the symbol {{ ______ }}.

Answer 29

The number of degrees by which an optically active compound rotates the plane of polarized light is called its specific rotation and is given the symbol [[[α] ]].

Question 30

Each member of a pair of {{ ______ }} rotates the plane of polarized light by the same number of degrees, but in opposite directions.

Answer 30

Each member of a pair of [[enantiomers]] rotates the plane of polarized light by the same number of degrees, but in opposite directions.

Question 32

Answer 32

Question 34

Chymotrypsin has {{ ______ }} stereocenters. The maximum number of stereoisomers possible is 2^251.

Answer 34

Chymotrypsin has [[251]] stereocenters. The maximum number of stereoisomers possible is 2^251.

Question 35

A dextrorotatory compound is indicated by {{ ______ }}

Answer 35

A dextrorotatory compound is indicated by [[a plus sign in parentheses]]

Question 36

Chymotrypsin has 251 stereocenters. The maximum number of stereoisomers possible is {{ ______ }}.

Answer 36

Chymotrypsin has 251 stereocenters. The maximum number of stereoisomers possible is [[2^251]].

Question 37

A levorotatory compound is indicated by {{ ______ }}.

Answer 37

A levorotatory compound is indicated by [[a minus sign in parentheses]].

Question 38

A polarimeter consists of a light source emitting unpolarized light, {{ ______ }}, an analyzer, and a sample tube.

Answer 38

A polarimeter consists of a light source emitting unpolarized light, [[a polarizer]], an analyzer, and a sample tube.

Question 39

Degree of Unsaturation C6 H8 Br2 O3 {{ ______ }}

Answer 39

Degree of Unsaturation C6 H8 Br2 O3 [[((2*6 + 2) - (8 + 2))/2 = 2 degrees of unsaturation]]

Question 40

A {{ ______ }} compound is indicated by a minus sign in parentheses.

Answer 40

A [[levorotatory]] compound is indicated by a minus sign in parentheses.